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Old 14th January 2013   #1
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Metabones "Speed Booster"

Metabones + Dr Brian Caldwell announced their new "Speed Booster",
actually a well known principle from astronomy, a focal reducer or telecompressor.

See here: Metabones - Metabones and Caldwell Photographic introduce Speed Booster

White Paper is here: http://www.metabones.com/images/meta...te%20Paper.pdf

Test is here: An adaptor which claims to make your lens, faster, wider and better!! This is NOT an April Fool’s! | Philip Bloom

****

Done that before for my sort of photography, see on my BLOG: Photography of the Invisible World: Search results for reducer

without reducer/telecompressor:


with reducer/telecompressor:


overall system changed from f4 to f1.6 and the focal length from 84mm to 34mm!
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Old 14th January 2013   #2
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Re: Metabones "Speed Booster"

There is a thread going here
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Old 14th January 2013   #3
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Re: Metabones "Speed Booster"

Quote:
Originally Posted by kds315
****

Done that before for my sort of photography, see on my BLOG: Photography of the Invisible World: Search results for reducer

without reducer/telecompressor:


with reducer/telecompressor:


overall system changed from f4 to f1.6 and the focal length from 84mm to 34mm!
I have fiddled around with such stuff based on Bausch & Lomb quartz-fluorite condensor stuff and i know the quality of results from such contraptions.

The "speed booster" in question, is a class apart. As Robert pointed out, there is thread going. Feel free to join in.

Last edited by Vivek; 14th January 2013 at 10:50. Reason: spelling
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Old 14th January 2013   #4
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Re: Metabones "Speed Booster"

Sure, his design is certainly a professional one and not just simple playing around with optics as we tend to both like ;-) But it helps to understand and opens doors...
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Old 14th January 2013   #5
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Re: Metabones "Speed Booster"

I was looking at buying a 200/2 for my micro4/3, but this makes me wait a little more, while the 300/2.8 + speedbooster = 210/1.96

At a fraction of the cost, I could even settle with some IQ deterioration !

Very promising, it seems to me !

C U
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Old 14th January 2013   #6
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Re: Metabones "Speed Booster"

Quote:
Originally Posted by f6cvalkyrie View Post
I was looking at buying a 200/2 for my micro4/3, but this makes me wait a little more, while the 300/2.8 + speedbooster = 210/1.96

At a fraction of the cost, I could even settle with some IQ deterioration !

Very promising, it seems to me !

C U
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Hi,

Which 300/2.8 lens did you have in mind?

In order to use a lens with Speed Booster it would need to be at a minimum an APS-C sensor covering lens.
http://www.metabones.com/images/meta...te%20Paper.pdf, page 3.
(It takes a little bit of time to download the pdf document!)

Also, according to Metabones announces 'Speed Booster' lens adapter for mirrorless cameras: Digital Photography Review, quote:

"Specialist accessory manufacturer Metabones and optics company Caldwell Photographics have jointly announced the 'Speed Booster', a lens adapter for for mounting SLR lenses on APS-C and Micro Four Thirds mirrorless cameras that reduces the focal length by a factor of 0.71x and increases the maximum aperture by 1 stop."

"On APS-C mirrorless cameras it offers an effective crop factor of 1.1x, meaning a lens will behave very similarly to how it does on full frame; on Micro Four Thirds the effective crop factor is 1.4x."

So, if one started with an appropriate 300/2.8 lens on an m4/3 camera with Speed Booster adapter, one would end up with this virtual configuration:

300 * 0.71 * 2 mm = 426 mm and 1 stop faster than f/2.8 = f/2. So approximately that is: 420/2

So, in order to get to your desired virtual configuration of 200/2 you would need to start with a 140/2.8 lens.

I am sorry for butting in. No insult intended.
If I am wrong please point out my mistakes.

With best regards, K-H.
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Old 15th January 2013   #7
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Re: Metabones "Speed Booster"

I think that you are mixing Focal Length (the real one) that I was referring to, and Field of View equivalent, taking the sensor crop factor into account.

I am using a Nikkor 300/2.8 IF ED, it covers FF so it should be OK for micro4/3 with the speed booster. It will have FL (real one) of 210mm or an equivalent Field of View (compared to 24x36) of 420. And it will be f/1.96 (~ 2)

C U,
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Old 15th January 2013   #8
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Re: Metabones "Speed Booster"

Hi Rafael,

Quote:
Originally Posted by f6cvalkyrie View Post
I think that you are mixing Focal Length (the real one) that I was referring to, and Field of View equivalent, taking the sensor crop factor into account.
Agreed, yes I did.

Quote:
Originally Posted by f6cvalkyrie View Post
I am using a Nikkor 300/2.8 IF ED, it covers FF so it should be OK for micro4/3 with the speed booster. It will have FL (real one) of 210mm or an equivalent Field of View (compared to 24x36) of 420. And it will be f/1.96 (~ 2)

C U,
Rafael
Thanks for the clarification. I agree.

So, in the end with both methods an FX Nikkor 300/2.8 IF ED on a m4/3 camera with Speed Booster adapter will have an equivalent angle/field of view of that of a FF 35 mm film camera with a 420/2 lens.

Ignoring the field of view part, the Speed Booster indeed turns the 300/2.8 into a 210/2 lens with m4/3 mount and a restricted circular view.

If the 300/2.8 lens is used with a regular adapter on a m4/3 camera the FF equivalent angle/field of view would be that of a 600/2.8 lens on a 35 mm film camera.

Thanks again for your reply.

With best regards, K-H.
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Old 10th February 2013   #9
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Re: Metabones "Speed Booster"

For m43, Does anyone know what makers NikonF/CanonEf or others will be supported on m43 speedbooster?
When will it be available?
How much would it cost?
I really wanna check or invest in interesting lenses to use with my future SB for m43?
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Old 10th February 2013   #10
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Re: Metabones "Speed Booster"

For the speed booster to be used, there has to be enough space on the mount of the system that it is applied, when compared to the lens used original mount, (for example... Nikon (or other 35mm classic) to NEX (or other modern mirror less)). The adapter, acts as an "image area compressor", reducing the lens original image's circle radius length by root square (approximately 1/1.4 of the original), but not the amount of light. Thus, there is a stop's gain of light, while the image circle is still larger than an APS-c sensor... Yet the AOV is now very near to the original one of the lens... for example, a 24mm full frame lens shows an AOV that in FF would be equal to 26.5mm when used on a NEX mount APS-c camera. Compression of image area is supposed to retain the lens original total resolution, which should result on more resolution for a given image area, than an equivalent area out of the original image circle.
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Old 3rd April 2013   #11
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Re: Metabones "Speed Booster"

I am an Indie Filmmaker, who, right now is trying to make the most of mobile filmmaking. I was wondering, whether anyone would be able to help me, to create a lens, for my mobile phone, which could increase the f-stop, by 1 stop.
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Old 4th April 2013   #12
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Re: Metabones "Speed Booster"

Quote:
Originally Posted by sanveer View Post
I am an Indie Filmmaker, who, right now is trying to make the most of mobile filmmaking. I was wondering, whether anyone would be able to help me, to create a lens, for my mobile phone, which could increase the f-stop, by 1 stop.
buy a better phone or small P&S... indie
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Old 1st June 2013   #13
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Re: Metabones "Speed Booster"

The Leica R to m43 Speed Booster is available now. Anybody given it a try?

EDIT: And C/Y to m43

Speed Booster

Speed Booster

Last edited by emr; 1st June 2013 at 11:40.
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Old 2nd June 2013   #14
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Re: Metabones "Speed Booster"

Quote:
Originally Posted by emr View Post
The Leica R to m43 Speed Booster is available now. Anybody given it a try?

EDIT: And C/Y to m43

Speed Booster

Speed Booster
I have a couple of old CY mount lesnes but not of the quality that I would bother using the Speed Booster with.

If they would like to produce the Speed Booster in Nikon F mount with an aperture control for MFT lenses, I will definitely buy one. I would like to use the Nikon 10-24mm zoom on it and I have a few others as well.
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Old 4th July 2013   #15
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Re: Metabones "Speed Booster"

Nikkor F and G to micro4/3 Speedbooster is now listed as available on the website !

Speed Booster

I just ordered one for use on my 300/2.8 and my 80-200/2.8

C U,
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Old 5th July 2013   #16
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Re: Metabones "Speed Booster"

Heh, you beat me to it. I have been watching for this for a while. I ordered mine this morning to use with all my old nikkors. Yum.

If it turns out to work well, I am seriously considering a Fuji XE-1 with a Nikon Fuji speed booster when it becomes available just to get the actual (almost) focal lengths out of my nikkors.

That would be the first time I would be running with two concurrent primary systems (M43 and Fuji).

We will see. But definitely looking forward to the m43 speed booster.

Doug
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Old 8th July 2013   #17
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Re: Metabones "Speed Booster"

Mine is scheduled to arrive on Tuesday. Could make for an interesting weekend ;-).

Doug
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Old 8th July 2013   #18
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Re: Metabones "Speed Booster"

Mine is "on the road", I'm really looking forward to it !

C U
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Old 10th July 2013   #19
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Re: Metabones "Speed Booster"

I just received mine today, couldn't resist the pleasure of running into the garden and shooting a few shots combining my nikkor 50/1.4 to the SB (combination giving 35mm f1.0)

Here :-)))





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Old 10th July 2013   #20
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Re: Metabones "Speed Booster"

Mine arrived yesterday, but I couldn't get to it until after dark...

Definitely a solid feeling piece of equipment.

I played a bit in the house, but I don't have processed the images yet.

Lenses I intend to try with it:

20mm f3.5, 24mm f2.8, 28mm f2.0 (yum), 35mm f2, 50mm f1.4, tamron 90 f2.5 macro, 105mm f2.5 (ironically gives the same angle of view and max aperture as the 75mm f1.8 once attached to the speed booster), 75-150mm series e, 200mm f4.

Putting the lenses on the OM-D gave the camera a certain heft to it. Not in a bad way, but definitely a different feel.

Doug
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Old 10th July 2013   #21
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Re: Metabones "Speed Booster"

This is from the speedbooster with the Samyang 85/1.4
The combination gives a 63mm f1.0, equivalent to a 126/1.0 on the E-M5
Quite unique, I think



Good night for now,
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Old 11th July 2013   #22
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Re: Metabones "Speed Booster"

Today, I mounted my Nikkor 300/2.8 IF-ED on the speedbooster.
Still shooting in the garden ...



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Old 12th July 2013   #23
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Re: Metabones "Speed Booster"

I have a Leica Hektor 125/2.5 that I can adapt to Nikon F mount, so I just mounted it on the SB.

These are some flower shots from this combination









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Old 12th July 2013   #24
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Re: Metabones "Speed Booster"

I love my Speed Booster. I put it on my Olympus OM-D E-M5 and hooked it up with my Nikkor 10-24mm f/3.5-4.5 zoom. Wow - I am really impressed.


Como Baths - s by peterb666, on Flickr


Como Sunrise 5 - s by peterb666, on Flickr


Como Sunrise 4 - s by peterb666, on Flickr
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Old 13th July 2013   #25
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Re: Metabones "Speed Booster"

Nice shots.

It would be interesting to compare it to the Panny 7-14...

A friend of mine has the 10-24 nikkor, hmmm.

Doug
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Old 13th July 2013   #26
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Re: Metabones "Speed Booster"

I've popped just about every nikkor mount lens I have on the adapter and took some very boring test shots (palm trees in the distance, a sign on a telephone pole, etc...). There are definitely some lenses that display better sharpness than they do using a regular adapter. Most of the lenses balance well with the OM-d and the adapter. The only lens that feels somewhat awkward is a 300mm f5.6 Tamron SP. It also does not achieved good infinity sharpness until stopped down. Closer up sharpness was better.

Other lenses were surprisingly sharp even wide open. With the one exception of a 50mm f1.4 nikkor. It has some interesting characteristics wide open with the speed booster that I will have to play with.

Hoping to get out tomorrow to do some real shooting.

Doug
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Old 13th July 2013   #27
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Re: Metabones "Speed Booster"

This is from the 50/1.4 on the SB, and wide open ...



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Old 13th July 2013   #28
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Re: Metabones "Speed Booster"

Quote:
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Nice shots.

It would be interesting to compare it to the Panny 7-14...

A friend of mine has the 10-24 nikkor, hmmm.

Doug
Thanks Doug

I wouldn't consider the Panasonic 7-14mm as it isn't that easy to mount filters on it. You can with a special adapter that goes with 130mm filters but it is an expensive route and turns a compact lens into something quite awkward.

Other than the image quality, what surprised me with the OMD and Nikkor 10-24 with Speed Booster was just how easy it was to use. I rarely use auto focus with the 10-24 anyway as I tend to do a lot of pre-dawn or night photography and use a tripod. Even the tiny tripod mount on the Speed Booster worked well, slotting straight into my Arca Swiss style tripod head clamp.

I have written up a review of the Speed Booster on my blog site.

Metabones Speed Booster Review
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Old 14th July 2013   #29
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Re: Metabones "Speed Booster"

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Thanks Doug

I wouldn't consider the Panasonic 7-14mm as it isn't that easy to mount filters on it. You can with a special adapter that goes with 130mm filters but it is an expensive route and turns a compact lens into something quite awkward.

Other than the image quality, what surprised me with the OMD and Nikkor 10-24 with Speed Booster was just how easy it was to use. I rarely use auto focus with the 10-24 anyway as I tend to do a lot of pre-dawn or night photography and use a tripod. Even the tiny tripod mount on the Speed Booster worked well, slotting straight into my Arca Swiss style tripod head clamp.

I have written up a review of the Speed Booster on my blog site.

Metabones Speed Booster Review
You bring up an interesting point with the use of filters on a speed-boosted 10-24. Have you tried it yet? I would have thought that a filter on this lens would cause vignetting unless you use a step-up ring.
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Old 15th July 2013   #30
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Re: Metabones "Speed Booster"

Okay, here are some shots with minimal processing from this weekend. I only shot with 5 lenses and did not go after particular lenses so much as shot as I normally would, choosing the lens for the subject.

First up, on the sharpness improvement parade are shots from a Nikkor 200mm f4 AIS. I had closeted this lens for years as I was unhappy with its sharpness and aberrations on my digital cameras. This is the one that convinces me there is something to the claims as to sharpness improvement.

First, a boring seagull shot:



Here is a link to the full image for pixel peeping:

http://www.castleintheair.com/Pictur...13-23.Full.jpg

Next, some nesting cormorants:



Now some shots with a 20mm f3.5 AIS and a K1 extension ring:









And now some shots with a 75-150 F3.5 Series E:









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Old 15th July 2013   #31
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Re: Metabones "Speed Booster"

I have a Series E 75-150 that I did not check yet against the SB.
Will try to do so in the next days.

I can confirm that the 80-200 f2.8 performs superbly on the SB !

C U
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Old 15th July 2013   #32
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Re: Metabones "Speed Booster"

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I have a Series E 75-150 that I did not check yet against the SB.
Will try to do so in the next days.

I can confirm that the 80-200 f2.8 performs superbly on the SB !

C U
Rafael
I am anxious to see more results the Series E 75-150. It is an excellent little zoom.
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Old 15th July 2013   #33
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Re: Metabones "Speed Booster"

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I am anxious to see more results the Series E 75-150. It is an excellent little zoom.
I have two of them .

Doug
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Old 15th July 2013   #34
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Re: Metabones "Speed Booster"

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You bring up an interesting point with the use of filters on a speed-boosted 10-24. Have you tried it yet? I would have thought that a filter on this lens would cause vignetting unless you use a step-up ring.
Not yet - I left my filters at home but I had my filter holder on and there was no vignetting.

When I first mounted the lens I did notice vignetting in the corners but that was indoors. I assume the vignetting is only at closer focus distances.

I don't expect too much in the way of vignetting but when using filters on any huge ultrawide lens, you do get gradual darkening on the sides due to the angle at which light is going through the filter. The path is longer towards the edges. I don't think it will be a huge problem.
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Old 15th July 2013   #35
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Re: Metabones "Speed Booster"

Here's from the 75-150 Series E on the SB on the E-M5

At the long end, 150mm on the zoomlens, or 210 eq FoV


at the short end, 75mm on the zoomlens, or 105 eq FoV


Nothing wrong with this combo, IMHO

C U,
Rafael
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Old 17th July 2013   #36
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Re: Metabones "Speed Booster"

I went back and looked at some recent shots with some of my nikkors prior to using the speed booster, and it appears there may indeed be some sharpness improvement. I am going to have to do more experimenting to see if that holds out.

Doug
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Old 17th July 2013   #37
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Re: Metabones "Speed Booster"

I would expect the centers to be slightly sharper with any lens but also the corners a bit softer. I believe that is a characteristic of the SB design.
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Old 19th July 2013   #38
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Re: Metabones "Speed Booster"

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I would expect the centers to be slightly sharper with any lens but also the corners a bit softer. I believe that is a characteristic of the SB design.
You are correct that the Metabones SB will make the center sharper with any virtually any lens - I haven't found an exception yet. In the case of the micro four thirds version this sharpness increase is extended over most of the image field, and for most fullframe lenses the corner sharpness with the SB is about the same as without the SB, even though the SB is revealing more of the lens' field of view. An exception is lenses with really long exit pupil distances (greater than ~100mm), which tend to show slightly weak corners with the SB. However, most people will likely be interested in more compact lenses which happen to have fairly short exit pupil distances (in the 50-85mm range), and the SB is ideal for these lenses.
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Old 19th July 2013   #39
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Re: Metabones "Speed Booster"

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You are correct that the Metabones SB will make the center sharper with any virtually any lens - I haven't found an exception yet. In the case of the micro four thirds version this sharpness increase is extended over most of the image field, and for most fullframe lenses the corner sharpness with the SB is about the same as without the SB, even though the SB is revealing more of the lens' field of view. An exception is lenses with really long exit pupil distances (greater than ~100mm), which tend to show slightly weak corners with the SB. However, most people will likely be interested in more compact lenses which happen to have fairly short exit pupil distances (in the 50-85mm range), and the SB is ideal for these lenses.
Hi Brian,

Actually, I am interested in all focal lengths. Case in point the 75-150 series e, or the 200mm f4, 105mm f2.5... And then on the shorter end, mostly because of the characteristics of the lenses themselves (28mm f2, 20mm f3.5). The only midrange lens I have interest in is the 50mm f1.4 which gives me a crazy f1.0 (or 1.2 if I use the 50mm f1.8).

A non m4/3 question regarding the speedbooster on Fuji or Sony cameras. Your comments above seems to imply that they will potentially suffer from corner softness more than on m4/3 (assuming because of the different crop factor and the fact that on those systems, the entire image circle of a FF lens is used when a speed booster is attached)? Would this also be true of using a DX lens on m4/3 then (the corner softness)?

Thanks,

Doug
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Old 19th July 2013   #40
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Re: Metabones "Speed Booster"

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An exception is lenses with really long exit pupil distances (greater than ~100mm)
Hi, Brian !

I have a nice collection of (partly vintage) Nikkor glass from film time (full frame, thous). I'm using them on an SB, apparently without problem.
Could you tell us which lenses in the Nikkor portfolio show such really long exit pupil distances that they might suffer from softer corner performance on the SB ?

TIA,
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Old 19th July 2013   #41
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Re: Metabones "Speed Booster"

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Hi Brian,

Actually, I am interested in all focal lengths. Case in point the 75-150 series e, or the 200mm f4, 105mm f2.5... And then on the shorter end, mostly because of the characteristics of the lenses themselves (28mm f2, 20mm f3.5). The only midrange lens I have interest in is the 50mm f1.4 which gives me a crazy f1.0 (or 1.2 if I use the 50mm f1.8).

A non m4/3 question regarding the speedbooster on Fuji or Sony cameras. Your comments above seems to imply that they will potentially suffer from corner softness more than on m4/3 (assuming because of the different crop factor and the fact that on those systems, the entire image circle of a FF lens is used when a speed booster is attached)? Would this also be true of using a DX lens on m4/3 then (the corner softness)?

Thanks,

Doug
Hi Doug:
I've really enjoyed seeing your images with various Nikkors on the SB.

The SpeedBooster will actually reveal slightly more field of view in a DX lens mounted to m4/3 than when the same lens mounted to a DX camera. In some cases this can cause vignetting, especially in ultrawide lenses that have permanently fixed lens hoods like the Sigma 8-16mm. In other cases the whole image will look great and you just get a little extra FOV as a bonus.

I'm personally very interested in seeing how the new 18-35/1.8 DX lens behaves with a SpeedBooster since the combination will be an amazing 12.5-25mm f/1.2 for m4/3. Another interesting lens I haven't checked out yet is the Sigma 30/1.4 DX, which would become a nice 21mm f1/0.
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Old 19th July 2013   #42
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Re: Metabones "Speed Booster"

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Hi Doug:
I've really enjoyed seeing your images with various Nikkors on the SB.

The SpeedBooster will actually reveal slightly more field of view in a DX lens mounted to m4/3 than when the same lens mounted to a DX camera. In some cases this can cause vignetting, especially in ultrawide lenses that have permanently fixed lens hoods like the Sigma 8-16mm. In other cases the whole image will look great and you just get a little extra FOV as a bonus.

I'm personally very interested in seeing how the new 18-35/1.8 DX lens behaves with a SpeedBooster since the combination will be an amazing 12.5-25mm f/1.2 for m4/3. Another interesting lens I haven't checked out yet is the Sigma 30/1.4 DX, which would become a nice 21mm f1/0.
Hi Brian,
It's been quite fun shooting with my Nikkors like this, and I have more to come.

The 18-35 with the speedbooster would be crazy. I also have a friend who has the Sigma 24mm f1.8... That could be interesting.

Do you have an idea as to an answer to my question above about Fuji/Nex and sharpness? The reason I am asking is that I am actually considering a fuji just for the purpose of shooting with my nikkors at close to their original FOV using the speed booster, but if they suffer in the corners and edges, it might not be as interesting for me.

I dread saying this, but I am actually considering doing some "lens tests", something I never do... :-o. Just to see how the lenses compare sharpness wise with and without.

Doug
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Old 19th July 2013   #43
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Re: Metabones "Speed Booster"

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Hi, Brian !

I have a nice collection of (partly vintage) Nikkor glass from film time (full frame, thous). I'm using them on an SB, apparently without problem.
Could you tell us which lenses in the Nikkor portfolio show such really long exit pupil distances that they might suffer from softer corner performance on the SB ?

TIA,
Rafael
Hi Rafael:
The problem with long exit pupil distances occurs mainly at small apertures. Because of the way the aberrations balance, the problems can actually be reduced at larger apertures.

I've seen a sample with the 135/2 DC Nikkor over at DPReview that showed a little bit of falloff in the extreme corner. I haven't measured the exit pupil for that lens, but if the patent design I have is accurate then its about 150mm, which is very long. Any of the super teles will also have a long exit pupil distance, but these are rarely used stopped-down to shoot photos that are sharp everywhere.

The more compact lenses generally will work great with the SB because their exit pupil distance falls predictably in the 50-85mm range. Here the SB introduces very little aberration on its own, so the performance you get depends on the quality of the attached lens. For example, the 60mm f/4 UVIR gives really sharp corner-to-corner images wide open with the SB.
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Metabones "Speed Booster"-60mm-uvir-x0-71-f4-_42mm-f2-8.tif  
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Old 19th July 2013   #44
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Re: Metabones "Speed Booster"

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Hi Brian,
It's been quite fun shooting with my Nikkors like this, and I have more to come.

The 18-35 with the speedbooster would be crazy. I also have a friend who has the Sigma 24mm f1.8... That could be interesting.

Do you have an idea as to an answer to my question above about Fuji/Nex and sharpness? The reason I am asking is that I am actually considering a fuji just for the purpose of shooting with my nikkors at close to their original FOV using the speed booster, but if they suffer in the corners and edges, it might not be as interesting for me.

I dread saying this, but I am actually considering doing some "lens tests", something I never do... :-o. Just to see how the lenses compare sharpness wise with and without.

Doug
Hi Doug:
Vivek Iyer's SpeedBooster thread over in the Sony forum has hundreds of sample images taken with the SB used on various Sony NEX cameras:

Speed booster for NEX

The SpeedBooster optics in the Fuji version are identical to those in the NEX version, so these images will be very representative of what you can expect. Many of the samples were taken with classic Nikkors via a Nikon-to-Canon adapter.

In general, the larger format SpeedBooster is a little more sensitive to exit pupil distance than the m4/3 version, but it works great with the classic compact fullframe lenses.
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Old 20th July 2013   #45
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Re: Metabones "Speed Booster"

Well, I went ahead and did some tests. Tripod, brick wall, etc (ick).

I tested the following: 300mmf5.6 tamron sp, 200mm f4 ais, 75-150 f3.5 series e, 105 f2.5 ais, 90mm f2.5 macro tamron sp, 50mm f1.4 ai, 35mm f2 ais, 28mm f2 ai, 24mm f2.8 ai.

I also threw in my 45mm f1.8 oly for some comparison.

General notes:

There seems to be a color shift. I will try doing a camera profile as well as a simple color card comparison to see if it is a linear shift or if there are certain colors that get shifted.

I noted in more than one lens a tendency to decrease or remove color fringing (not CA, fringing).

In most lenses, as I stopped the lens down, if there was an improvement, it became more pronounced. This became more noticeable on some lenses out to the corners where stopping down sometimes gave a bigger boost to sharpness for the SB. In some cases where wide open, the SB was softer, stopping down allowed the SB iteration to catch up and/or surpass the lens on its own.

Surprisingly, none of my wider lenses fared as well as I would have expected.

Take all this with a grain of salt . Sometimes the dog was so thin that it could easily have affected the results.

Also, none of these were a test of lens "character" which ultimately would be most interesting to me...

On to the lenses:

300mm tamron: not a real win here. The corners smeared some and there never was that much improvement.

200mm f4: one of the bigger winners. Sharper across the frame immediately.

75-150mm series e: another of the big winners. Sharper across the frame. Green fringing removed. This was at 150mm. I should have also tested others focal lengths.

105mm f2.5: surprisingly not as good results. There was some fringing removal. The corners smeared noticeably outwards, and although stopping down helpd this, it never went away completely. Stopping down did provide greater center sharpness.

90mm f2.5 tamron macro: another big winner. Sharper across the frame from the start. Some fringing removed. Stopping down helped even more.

50mm f1.4: not really much gain here at all. Stopping down did not seem to get any further.

35mm f2: the worst of the lot. If anything, with the SB, it was softer. Stopping down helped some but never fully. This is one where I question if I failed in the testing some.

28mm f2: wide open, this also seemed there was no improvement or even some loss, but stopping down switched this around a fair bit.

28 mm f2.8: sharper in the center, but softer at the edges. Stopping down definitely helped here.

Doug
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Old 20th July 2013   #46
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Re: Metabones "Speed Booster"

Interesting, thanks. In short, do you find it worth purchasing?

BTW, you should feed the dog.
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Old 21st July 2013   #47
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Re: Metabones "Speed Booster"

Quote:
Originally Posted by greypilgrim View Post
Well, I went ahead and did some tests. Tripod, brick wall, etc (ick).

I tested the following: 300mmf5.6 tamron sp, 200mm f4 ais, 75-150 f3.5 series e, 105 f2.5 ais, 90mm f2.5 macro tamron sp, 50mm f1.4 ai, 35mm f2 ais, 28mm f2 ai, 24mm f2.8 ai.

I also threw in my 45mm f1.8 oly for some comparison.

General notes:

There seems to be a color shift. I will try doing a camera profile as well as a simple color card comparison to see if it is a linear shift or if there are certain colors that get shifted.

I noted in more than one lens a tendency to decrease or remove color fringing (not CA, fringing).

In most lenses, as I stopped the lens down, if there was an improvement, it became more pronounced. This became more noticeable on some lenses out to the corners where stopping down sometimes gave a bigger boost to sharpness for the SB. In some cases where wide open, the SB was softer, stopping down allowed the SB iteration to catch up and/or surpass the lens on its own.

Surprisingly, none of my wider lenses fared as well as I would have expected.

Take all this with a grain of salt . Sometimes the dog was so thin that it could easily have affected the results.

Also, none of these were a test of lens "character" which ultimately would be most interesting to me...

On to the lenses:

300mm tamron: not a real win here. The corners smeared some and there never was that much improvement.

200mm f4: one of the bigger winners. Sharper across the frame immediately.

75-150mm series e: another of the big winners. Sharper across the frame. Green fringing removed. This was at 150mm. I should have also tested others focal lengths.

105mm f2.5: surprisingly not as good results. There was some fringing removal. The corners smeared noticeably outwards, and although stopping down helpd this, it never went away completely. Stopping down did provide greater center sharpness.

90mm f2.5 tamron macro: another big winner. Sharper across the frame from the start. Some fringing removed. Stopping down helped even more.

50mm f1.4: not really much gain here at all. Stopping down did not seem to get any further.

35mm f2: the worst of the lot. If anything, with the SB, it was softer. Stopping down helped some but never fully. This is one where I question if I failed in the testing some.

28mm f2: wide open, this also seemed there was no improvement or even some loss, but stopping down switched this around a fair bit.

28 mm f2.8: sharper in the center, but softer at the edges. Stopping down definitely helped here.

Doug
Assuming you didn't move the iris diaphragm before and after attaching the SB, then its worth remembering that you are comparing images with a full stop of f/# difference (e.g. f/1.4 vs. f/1.0).

Also, with something like the 50/1.4 the real gain aside from an MTF boost near the center of the image is that you now have a very compact 35mm f/1.0 lens for your m4/3 camera, which otherwise doesn't exist. The 28/2 becomes a similarly unobtainable 20mm f/1.4, and so on.

So, for instance, it might be interesting to compare your 35/2 (sans SB) with your new 35mm f/1.0 lens at identical f/#'s when used on a m4/3 camera.
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Old 21st July 2013   #48
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Re: Metabones "Speed Booster"

Totally agree with you, Brian !

For me, the interest of the SB is to bring in reach (financially, I have to admit, or at all) combinations that would have otherwise been unreachable.

I'm talking about the 200/f2.0, the 35/f1.0, the 60/f1.0 and so on ...

Absolute image quality, a bit less contrast, some loss of sharpness in the corners, ... do not bother me all that much. Very often not a thing that cannot be corrected in PP, I found so far ...

Even cheap lenses like the 75-150 Series E become suddenly lenses otherwise not available to micro4/3 : 50-105/2.5 is a lovely fast zoom that many µ4/3 shooters are longing for !

And my 80-200/2.8 turned into 55-140/f2.0 Where do you find that ???

Congrats, your SB makes my Nikkor collection twice as valuable on my E-M5
!

CU,
Rafael
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Old 21st July 2013   #49
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Re: Metabones "Speed Booster"

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Interesting, thanks. In short, do you find it worth purchasing?

BTW, you should feed the dog.
Yeah, that dog. Stoopid ipad autocorrect strikes again.

Doug
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Old 21st July 2013   #50
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Re: Metabones "Speed Booster"

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Interesting, thanks. In short, do you find it worth purchasing?

BTW, you should feed the dog.
Oh, yes, absolutely, I think it is a worthwhile purchase. A fine piece of workmanship that opens up some interesting possibilities.

Doug
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