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Thread: Speed booster for NEX

  1. #251
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    Re: Speed booster for NEX

    In the mean time here are a couple of snaps from Summicron R 50/2 under totally flat, overcast light.


    Untitled by Vivek Iyer, on Flickr


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Summicron R 50/2, Effective f/1.4, 蛇
    Last edited by Vivek; 9th February 2013 at 14:00.
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    Re: Speed booster for NEX

    Mixed light, indoors. My favorite from a few hours ago.


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Olympus OM 85/2, Effective f/1.4, 蛇
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    Re: Speed booster for NEX

    Vivitar Series 1 90/2.5. Manually focused and handheld shot.


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Vivitar S1, 90/2.5, Effective f/1.8, 蛇
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    Re: Speed booster for NEX

    vivek, love the mixed light indoor shot. The bokeh is nice and creamy. Some of those Olympus lens are definitely collectable and usable for modern sensor mirrorless. Love how with speed booster you get the real focal length of the lens, and hence get the most of the narrow depth of field these legacy lens have to offer.

    I will still hold my ground though, and consider one, once they sort out the slow AF for Canon EF, and utilize PDAF sensors on the Nex 5R and Nex6.

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    Re: Speed booster for NEX

    The CY Contax 35-70 3.4 on Nex 5n via Canon SB vignettes at 35mm 3.4 in dim light, which is not so noticeable at 3.4 in daylight. In dim light it is much better by 8.

    35mm 3.4


    35mm 8


    35mm 3.4


    35mm 8


    70mm 3.4


    70mm 8


    70mm 3.4


    70mm 8
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    Re: Speed booster for NEX

    John, It is consistent with that lens' behavior on FF.

    See: http://lenses.zeiss.com/content/dam/..._35-70mm_e.pdf

    All the Contax/Yashica Zeiss lenses data (barring the 100/3.5 Sonnar): http://lenses.zeiss.com/camera-lense...x_yashica.html


    Is your infinity focus correct at f/3.4?
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    Re: Speed booster for NEX

    Thanks Vivek for the Zeiss data point!
    I had to adjust the SB for infinity focus to work.
    John
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    Re: Speed booster for NEX

    Vivek, that is an awesome link for the Zeiss data, thank you.

    A couple of requests.

    First, to BrianC...any news on when the Minolta SR/MD speed booster will be available? I am champing at the bit to use one of these with my old Rokkors.

    Second, can anyone do a test with the EF speedbooster and the old, discontinued EF 20-35mm 3.5/4.5? That is a great old Canon lens which is very compact and I think it would do well on the NEX in this combo. Especially with the increase in f stops. If anyone can post up some examples (pictures from the lens and photos of the lens mounted on a NEX) I would be very grateful.
    If Caesar was alive today I would be chained to an oar.
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    Re: Speed booster for NEX

    Quote Originally Posted by f/otographer View Post
    Vivek, that is an awesome link for the Zeiss data, thank you.

    A couple of requests.

    First, to BrianC...any news on when the Minolta SR/MD speed booster will be available? I am champing at the bit to use one of these with my old Rokkors.
    Metabones is interested in developing a Minolta MD version, but as far as I know this is still just something that is being investigated rather than a definite product plan. The QA page on the Metabones site is pretty accurate for questions like this: Questions?

    One little tidbit I have heard is that some lenses that have mechanical interference with the Speed Booster don't actually interfere with the glass, but rather with mechanical structure that holds the glass. This type of interference can probably be successfully dealt with in future versions of the SB.

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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    John, It is consistent with that lens' behavior on FF.

    See: http://lenses.zeiss.com/content/dam/..._35-70mm_e.pdf

    All the Contax/Yashica Zeiss lenses data (barring the 100/3.5 Sonnar): Contax-Yashica


    Is your infinity focus correct at f/3.4?
    Hi Vivek:
    Thanks for posting the Zeiss data sheet. Using the published exit pupil data for the 35-70/3.4 I was able to check the SB design and can verify that the SB itself won't contribute any vignetting at all at the 35mm end. In other words, 100% of the vignetting seen in John's 35mm/3.4 test shot (25mm f/2.4 actual) is due to the attached zoom lens.

    The exit pupil distance of the 35-70mm/3.4 grows from 57mm to 78.6mm as you zoom from 35mm to 70mm. For an exit pupil distance of 78.6mm its possible to get a trace of vignetting in the extreme corner with the Speed Booster, but most likely the zoom lens blocks the pertinent rays before they even get to the SB so that the SB effectively contributes no vignetting throughout the zoom range.
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    Re: Speed booster for NEX

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    Re: Speed booster for NEX

    Quote Originally Posted by brianc1959 View Post
    Metabones is interested in developing a Minolta MD version, but as far as I know this is still just something that is being investigated rather than a definite product plan. The QA page on the Metabones site is pretty accurate for questions like this: Questions?
    Thanks for that Brian. I emailed them some time back and the response was that it was on their roadmap to be produced. Now it appears that it may not be a sure thing, but rather still up in the air. Well here's hoping. I mainly shoot old Rokkors and an SR speedbooster would make me really have no need for the new FF NEX that will be coming out.

    I would like to personally thank you for the work you did to make the speedbooster a reality. It is an incredible new product and I know many people, myself included, are very excited about it.
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    Re: Speed booster for NEX

    Quote Originally Posted by Slingers View Post
    C/Y 28/2.8 @ f/2
    This is another FL, I would have trouble choosing a lens for! I tried the humble OM 28/2.8, Nikkor 28/2.8, Elmarit 28/2.8, a Vivitar S1 28/1.9...all look good to me with the SB combo!

    It has been a long time since I could see the focal plane, at f/2 (or wide open) clearly delineated by a 28mm wide lens!

    I look forward to seeing more samples with the C/Y 28/2.8, Slingers.

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    Re: Speed booster for NEX

    Thanks Brian,
    Your assistance has been so helpful on many points!
    John

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    Re: Speed booster for NEX

    Quote Originally Posted by f/otographer View Post
    Thanks for that Brian. I emailed them some time back and the response was that it was on their roadmap to be produced. Now it appears that it may not be a sure thing, but rather still up in the air. Well here's hoping. I mainly shoot old Rokkors and an SR speedbooster would make me really have no need for the new FF NEX that will be coming out.

    I would like to personally thank you for the work you did to make the speedbooster a reality. It is an incredible new product and I know many people, myself included, are very excited about it.
    Thanks for your kind comments - I hope the SB is a useful tool for your work.

    Before coming out with a new dedicated mount version we have to be reasonably certain that *all* lenses made for that mount will actually function properly without any mechanical interference with the SB glass. Since many of the desirable lens mounts are "extinct" this is a daunting task for a small company. The total number of different models of 35mm SLR lenses made in the last 50+ years is truly mind boggling!
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    Re: Speed booster for NEX

    Quote Originally Posted by John Inglis View Post
    Thanks Brian,
    Your assistance has been so helpful on many points!
    John
    Thank you for publishing sample images! In many respects the Zeiss 35-70/3.4 looks like a very promising lens for use with the SB since its exit pupil distance (not to be confused with focal length) passes right through the 60-65mm "sweetspot".
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    Re: Speed booster for NEX

    I trimmed off the rear shroud of my Elmarit R 28/2.8 (this is the first version) and, now, it can focus to infinity without any problems. The Summicron R 50/2 is now painted to get rid off the shiny surface from the filing. The Elmarit will undergo such an operation soon. For some odd reason, I have been quite slow but thorough with these in the past days. The Elmarit is shown attached to a R to EOS adapter.

    One of the things to note is the absence of IR markings on both the lenses. Of all the makers when Leica do not put an IR mark, it does mean something and it shows how well color corrected the images one gets out of these lenses (it is entirely worth the bother to do these minor modifications to put them to use). The taking lens for this shot, an OM 28/2.8, OTOH, does have an IR mark.


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Olympus OM 28/2.8, 0.3m, Effective f/4
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    Re: Speed booster for NEX

    Contax CY 28-85mm 3.3-4

    28mm


    85mm


    85mm
    Last edited by John Inglis; 12th February 2013 at 17:42. Reason: photos to appear
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    Re: Speed booster for NEX

    Some of these might be cross-posts from the Nex-7 thread, but here are some more w/ the ME-R on the Nex-7. The center sharpness is pretty awesome.


    DSC06321.jpg by Taylor Sherman, on Flickr


    DSC06327.jpg by Taylor Sherman, on Flickr


    DSC06202.jpg by Taylor Sherman, on Flickr
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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    This is another FL, I would have trouble choosing a lens for! I tried the humble OM 28/2.8, Nikkor 28/2.8, Elmarit 28/2.8, a Vivitar S1 28/1.9...all look good to me with the SB combo!

    It has been a long time since I could see the focal plane, at f/2 (or wide open) clearly delineated by a 28mm wide lens!

    I look forward to seeing more samples with the C/Y 28/2.8, Slingers.
    Hi Vivek, Yeah i plan to get out and take some proper photos that make use of the wide angle and to compare with the sigma 19/2.8. Just finishing off some samples of my C/Y 85/2.8 and will post them soon. However again are quick ones around the house.

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    Re: Speed booster for NEX

    Bokeh from the C/Y Sonnar is simply awesome!

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    Re: Speed booster for NEX

    Quote Originally Posted by Slingers View Post
    Hi Vivek, Yeah i plan to get out and take some proper photos that make use of the wide angle and to compare with the sigma 19/2.8. Just finishing off some samples of my C/Y 85/2.8 and will post them soon. However again are quick ones around the house.
    I would like to hear your thoughts on that 19mm Sigma.

    FWIW, Only the Nikon 28/2.8 AiS appears to be great at infinity. The other 3 (Olympus, Vivitar and Leica) less so. This is just preliminary observations.

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    Re: Speed booster for NEX

    Vivek, just wondering, the ever so slight corner softness when using the speed booster with fast aperture EF lens when used wide open, does this apply to slower wide angle prime lens as well?, eg 15mm f3.5 say?

    The reason I ask, is if I do get a speed booster, not only would I enjoy the added narrow depth and extra light, but also would like to use it for my ultra wides to capture landscapes which typically use infinite focus

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    Re: Speed booster for NEX

    Quick question...does the Summicron 50/2 require 'modification' to use on both the EF speedbooster (with R adapter) and the actual Leica R speedbooster?
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    Re: Speed booster for NEX

    Quote Originally Posted by f/otographer View Post
    Quick question...does the Summicron 50/2 require 'modification' to use on both the EF speedbooster (with R adapter) and the actual Leica R speedbooster?
    I can not answer that directly since I only have the EOS mount SB (which IMO is identical to the R version when an R adapter is mount).

    This has been a known issue to Canon EOS users. Take a look here, for example:

    SPECIFIC LEICA-R LENSES WHICH MAY NOT WORK ON A CANON dSLR

    Other than that Google is your friend.

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    Re: Speed booster for NEX

    Hi Vivek,

    I am finally having some fun with the MSB.

    Attachment 69357
    Sony NEX-5N + METABONES L/R - E mount Speed Booster + Leica Vario-Elmarit-R 1:2.8-4.5/28-90 ASPH.

    Full Frame image here: Re: Metabones Speed Booster - Vignetting with Tele-Lenses: Sony NEX Talk Forum: Digital Photography Review

    With best regards, K-H.

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    Re: Speed booster for NEX

    Awesome, K-H

    I see the sun is shining in your neck of the woods.

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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    Awesome, K-H

    I see the sun is shining in your neck of the woods.

    Thanks Vivek. Today couldn't have been nicer.
    It was warm and sunny, a shirt was good enough to keep warm outside.

    Well for certain situations the MSB and the Leica Elmarit 28-90 seem to be a winning combination.

    With best regards, K-H.

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    Re: Speed booster for NEX

    The absence of a NEX-7 also helps, i think!

    Yesterday, i made a few snaps indoors with a 6 and noticed that it took a few good seconds for the camera to get the WB right, along with that the exposure. Prior to that, the camera would let me take photos but with incorrect parameters. On asunny day, these differ quite a bit.
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    Re: Speed booster for NEX

    A couple of snaps ~ 2.5meters using a Tamron zoom (http://www.adaptall-2.org/lenses/46A.html).


    Untitled by Vivek Iyer, on Flickr


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Tamron 70-210 f/3.8-4, Effective 210mm, f/2.8, ISO800, Handheld

    I could not locate the 75-300 Nikon zoom I have, somewhere.

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    Re: Speed booster for NEX

    Quote Originally Posted by mazor View Post
    Vivek, just wondering, the ever so slight corner softness when using the speed booster with fast aperture EF lens when used wide open, does this apply to slower wide angle prime lens as well?, eg 15mm f3.5 say?

    The reason I ask, is if I do get a speed booster, not only would I enjoy the added narrow depth and extra light, but also would like to use it for my ultra wides to capture landscapes which typically use infinite focus
    Here are a few sample shots (dreary day, can't help it) from a Sigma 15-30 zoom at the wide end.

    Upclose:


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Sigma DG 15-30 f/3.5-4.5, Effective 10mm, f/2.5

    At infinity:


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Sigma DG 15-30 f/3.5-4.5, Effective 10mm, f/7.1

    Extreme corner crop of that:


    Untitled by Vivek Iyer, on Flickr

    This lens and the sample is not without problems. The bulbous front element of this zoom is also made of of Plastic.

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    Re: Speed booster for NEX

    Swirly bokeh from an yesteryear's lens is fully preserved .


    Untitled by Vivek Iyer, on Flickr


    Untitled by Vivek Iyer, on Flickr
    NEX-6, Speed Booster, Enna Lithagon II 85mm f/1.5, Effective f/1


    The Biotar 75/1.5 has a similar bokeh. I still am waiting for a M42 mount adapter to arrive.

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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    The possibilities of the speed booster on the m43rds are even more than the one for the APS-C sensors.

    Consider the Sigma 8-16 zoom made for APS-C. With 0.71x factor, on the m43rds, it becomes the widest ultrawide possible.

    The white paper I linked above discusses quite a few possibilities.

    If you look carefully, you would also find that there are two separate optical designs- one for m43rds and another for APS-C. There are specific reasons for this.

    Personally, I would consider using my OM lenses with the speed booster on the NEX'. The OM 50/1.2 which is the lightest and more compact of all the 35mm lenses being the most attractive.
    Actually you can't do that.... you have to use a FF lens on the adapter... What is compressed is the image circle to a smaller one, so lenses with a smaller image circle will be compressed to an even smaller image circle and will be unable to cover the whole image area even if it's one of 18mm width....
    The reason for the different optical design for 4/3rds is because the light sensitive area to mount distance is different than NEX....

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    Re: Speed booster for NEX

    Quote Originally Posted by Theodoros Fotometria View Post

    Actually you can't do that.... you have to use a FF lens on the adapter... What is compressed is the image circle to a smaller one, so lenses with a smaller image circle will be compressed to an even smaller image circle and will be unable to cover the whole image area even if it's one of 18mm width....
    The reason for the different optical design for 4/3rds is because the light sensitive area to mount distance is different than NEX....

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    Re: Speed booster for NEX

    Quote Originally Posted by Theodoros Fotometria View Post

    Actually you can't do that.... you have to use a FF lens on the adapter... What is compressed is the image circle to a smaller one, so lenses with a smaller image circle will be compressed to an even smaller image circle and will be unable to cover the whole image area even if it's one of 18mm width....
    The reason for the different optical design for 4/3rds is because the light sensitive area to mount distance is different than NEX....
    You can use DX format optics on the upcoming m4/3 Speed Booster, and an example is shown in our white paper using the Nikon 35/1.8 DX lens.

    However, its important to note that the m43 Speed Booster will have the same 0.71x reduction factor as the NEX version. This is a bit less than the optimal value of 0.75x you would want for converting DX lenses to m43 format. As a result, DX format lenses will appear slightly wider when converted to m43 via a Speed Booster than they do on a DX format sensor.

    For many lenses such as the Nikon 35/1.8 or Sigma 30/1.4 this is purely beneficial. However, its possible that a few ultrawides may show some corner vignetting since we are revealing more of their image circle than was originally intended.

    Another thing to keep in mind with the upcoming m4/3 version is that some DX format ultrawides have a non-removable lens shade. Due to the aspect ratio mismatch such a shade can cause vignetting along the long sides of the final m4/3 image.

    Of course, if you are using a Black Magic camera these two issues go away because of the slightly higher crop factor

    At some point we may decide to build a special 0.75x Speed Booster for adapting EF-S and DX optics to m4/3, but we are starting out with a 0.71x version because it gives a full stop speed increase and it works better with FF optics.

    The m4/3 version uses different optics than the NEX version mainly because we were able to improve optical performance by optimizing for the smaller format.

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    Re: Speed booster for NEX

    Quote Originally Posted by brianc1959 View Post
    You can use DX format optics on the upcoming m4/3 Speed Booster, and an example is shown in our white paper using the Nikon 35/1.8 DX lens.

    However, its important to note that the m43 Speed Booster will have the same 0.71x reduction factor as the NEX version. This is a bit less than the optimal value of 0.75x you would want for converting DX lenses to m43 format. As a result, DX format lenses will appear slightly wider when converted to m43 via a Speed Booster than they do on a DX format sensor.

    For many lenses such as the Nikon 35/1.8 or Sigma 30/1.4 this is purely beneficial. However, its possible that a few ultrawides may show some corner vignetting since we are revealing more of their image circle than was originally intended.

    Another thing to keep in mind with the upcoming m4/3 version is that some DX format ultrawides have a non-removable lens shade. Due to the aspect ratio mismatch such a shade can cause vignetting along the long sides of the final m4/3 image.

    Of course, if you are using a Black Magic camera these two issues go away because of the slightly higher crop factor

    At some point we may decide to build a special 0.75x Speed Booster for adapting EF-S and DX optics to m4/3, but we are starting out with a 0.71x version because it gives a full stop speed increase and it works better with FF optics.

    The m4/3 version uses different optics than the NEX version mainly because we were able to improve optical performance by optimizing for the smaller format.
    What you are saying Brian, is that most APS-c lenses have larger image circle than what is needed to cover an APS-c sensor ...no? But again, using some of this extra area, wouldn't affect edge and especially corner image quality? ...Wouldn't it enhance vignetting and perhaps add more distortion than the original lens characteristics?

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    Re: Speed booster for NEX

    DX Nikkor zoom 18-55. All shots wide open. Fuzzy because the lens was set to infinity and the wall is a bit too close.
    Would this cover an m4/3rds sensor? It is quite easy to see.

    With the hood on, at 18mm


    Untitled by Vivek Iyer, on Flickr

    Without the hood 18mm


    Untitled by Vivek Iyer, on Flickr

    With the hood at 24mm


    Untitled by Vivek Iyer, on Flickr

    Without the hood at 24mm


    Untitled by Vivek Iyer, on Flickr

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    Re: Speed booster for NEX

    DX Nikkor 10.5mm with the SB on NEX-6. Effective f/2, 7.5mm. The top right orange stuff is slightly behind (!) the lens. The original built in hood on the lens is still there. The results are quite similar to the ones from FF Canon 5D or a Nikon camera.


    Untitled by Vivek Iyer, on Flickr

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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    DX Nikkor 10.5mm with the SB on NEX-6. Effective f/2, 7.5mm. The top right orange stuff is slightly behind (!) the lens. The original built in hood on the lens is still there. The results are quite similar to the ones from FF Canon 5D or a Nikon camera.
    Interesting experiments, and nice photo of the rilling on the inside of your lens hood!

    Since the hood on the 10.5mm DX Nikkor is shaped for a 3:2 format you will probably get some vignetting along the upper and lower parts of the image when cropped to m4/3 proportions, but perhaps not along the left and right hand sides.

    The actual m4/3 SB will behave similarly to your experiment with the NEX version, with the main difference being improved corner performance.

    On a related note, I have noticed that at least one person posting on DPReview has been successful in using a Canon EF-S lens with the NEX SB by removing a rear plastic shroud. Apparently there was no glass-glass collision. YMMV, of course.

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    Re: Speed booster for NEX

    Thanks for the post Vivek! ...it's exactly what I meant ...However, what Brian says (I think...) is that due to the lesser image area width, the SB for 4/3rds, allows (almost) the APS-c image circle to just about cover the whole 4/3rds area, especially with some lenses that have wider image circle than what is necessary to cover the APS-c sensor... ...I don't deny that this may be the case, but using more area of what the lens designers allowed and users buy it for, it would provide a lens with different (worst) characteristics than it is expected from it... I would stick with FF lenses only for the SB... Actually, I will buy the SB immediately when it will be available for Nikon lenses to NEX, since I recently changed the videocameras we where using in "Fotometria" to interchangeable lens ones with NEX mount and I own a huge collection of Nikkor FF lenses which I now use through adapters... I suppose you used a N-C adapter to mount the nikkors on your SB ...no?

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    Re: Speed booster for NEX

    Quote Originally Posted by brianc1959 View Post

    On a related note, I have noticed that at least one person posting on DPReview has been successful in using a Canon EF-S lens with the NEX SB by removing a rear plastic shroud. Apparently there was no glass-glass collision. YMMV, of course.
    I found that (the thread that K-H linked here) and find that rear baffle construction of EFS 10-22 very similar to those of the IX-Nikkors. I still have a 30-60 IX-NIkkor (modified) somewhere. Your caution is apt as not all may work.
    Last edited by Vivek; 16th February 2013 at 14:27.

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    Re: Speed booster for NEX

    Quote Originally Posted by Theodoros Fotometria View Post
    I suppose you used a N-C adapter to mount the nikkors on your SB ...no?
    Yes, the cheapest one I could find and hence all the G lenses are shot wide open (the aperture prong held by a toothpick).

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    Re: Speed booster for NEX

    Quote Originally Posted by Theodoros Fotometria View Post
    Thanks for the post Vivek! ...it's exactly what I meant ...However, what Brian says (I think...) is that due to the lesser image area width, the SB for 4/3rds, allows (almost) the APS-c image circle to just about cover the whole 4/3rds area, especially with some lenses that have wider image circle than what is necessary to cover the APS-c sensor... ...I don't deny that this may be the case, but using more area of what the lens designers allowed and users buy it for, it would provide a lens with different (worst) characteristics than it is expected from it... I would stick with FF lenses only for the SB... Actually, I will buy the SB immediately when it will be available for Nikon lenses to NEX, since I recently changed the videocameras we where using in "Fotometria" to interchangeable lens ones with NEX mount and I own a huge collection of Nikkor FF lenses which I now use through adapters... I suppose you used a N-C adapter to mount the nikkors on your SB ...no?
    Yes, since the 0.71x version of the Speed Booster for m4/3 will show a bit more of the image circle of DX lenses than would be seen if you mount that same DX lens on a DX format camera. Whether you like it or dislike it will undoubtedly depend on what lens you use. Of course, you can always crop out the offending bits!

    Personally, I'm starting to like the idea of a special 0.75x Speed Booster to adapt DX and EF-S to m4/3. The relaxed magnification would allow for incredibly high optical performance that is really needed on m4/3.

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    Re: Speed booster for NEX

    Contax CY 100-300 4.5-5.6 at 100mm on Canon SB on 5n,



    at 300mm



    Happy that vignetting does not dominate the corners!
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    Re: Speed booster for NEX

    Very nice, John. Not only the smooth OOF rendition but the image clarity in the focused areas are top notch!

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    Re: Speed booster for NEX

    Other than my own curiosity, I have had some queries if the SB is useful for UV captures.

    Here are two shots using the UV-Nikkor 105/4.5S lens.

    Visible:


    Untitled by Vivek Iyer, on Flickr
    Modified NEX-C3, Speed Booster, UV-Nikkor 105 f/4.5, Effective f/4, UV-IR cut filter, ISO1600, 1/1000s

    Reflected UV (false color)


    Untitled by Vivek Iyer, on Flickr
    Modified NEX-C3, Speed Booster, UV-Nikkor 105 f/4.5, Effective f/4, Baader U 2" filter, ISO1600, 1/10s, UV capture

    The Baader U 2" filter transmits between 320nm to 390nm. Given ~7 stop drop while going from Visible light to UV (natural UV content of daylight), it appears that the Speed Booster has excellent UV transmission!

    Now, I have to look for a Brian Caldwell 60/4 UV-Vis-IR Apo Macro lens!

    One note of caution:

    Anyone wanting to use the 35mm f/3.5 Noflexar lens be beware that the lens would damage the SB optics at infinity!
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    Re: Speed booster for NEX

    Quote Originally Posted by brianc1959 View Post

    The actual m4/3 SB will behave similarly to your experiment with the NEX version, with the main difference being improved corner performance.
    Looking forward to the M43 version. I've been watching this thread every day to see the results people are getting.

    I've even pondered getting an XE1 at such time as the Nikon to Fuji speedbooster becomes available (unless of course there really was a "full frame" version of the m43 coming ;-))

    Doug

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    Re: Speed booster for NEX

    Quote Originally Posted by Vivek View Post
    Other than my own curiosity, I have had some queries if the SB is useful for UV captures.

    Here are two shots using the UV-Nikkor 105/4.5S lens.
    Very interesting result Vivek!

    FWIW, any UV capability is purely coincidental - its not something that I considered when doing the design. Assuming perfect coatings (i.e., just accounting for the intrinsic absorption of the glass) I calculate the following transmission values for the Speed Booster:
    400nm - 94%
    390nm - 90%
    380nm - 81%
    370nm - 60%
    365nm - 49%

    I can't do any calculations below 365nm because one of the glass types (S-TIH1) basically has zero transmission at 360nm and below. So I wouild assume that 365nm is pretty much the limit. The coatings are an efficient multilayer design tuned for the visible, so they will definitely cause a significant drop in transmission for the values I've given above.

    Also, the Speed Booster will suffer from a large amount of chromatic aberration in the UV band. Did you re-focus when you added the Baader filter?

    By contrast, the Speed Booster actually works very well in the near infrared, with surprisingly low chromatic aberration all the way out to 1.0 microns. The coatings will also be better in the IR than they are in the UV.

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    Re: Speed booster for NEX

    Quote Originally Posted by greypilgrim View Post
    Looking forward to the M43 version. I've been watching this thread every day to see the results people are getting.

    I've even pondered getting an XE1 at such time as the Nikon to Fuji speedbooster becomes available (unless of course there really was a "full frame" version of the m43 coming ;-))

    Doug
    I'm not sure I understand what a "full frame version of the m43" is??

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