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Thread: No love for the Mitakon 50 f0.95?

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    Sr. Administrator Jack's Avatar
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    No love for the Mitakon 50 f0.95?

    Are Don and I the only ones here that like (okay, LOVE) this lens???
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Senior Member MikeEvangelist's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    It's tempting.

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    Senior Member MikeEvangelist's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Jack, do you have the newer version (67mm filters)?

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    Sr. Administrator Jack's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Mike, yes I do (and so does Don). It's a pretty nice hunk of glass for the money, and to my eye what I'm getting is every bit as good as (or even better than) the best I ever got with the Leica Noct on a digital M body...
    Jack
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    I want to try it in Moab
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Sr. Administrator Jack's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Only if you promise to give it back to me right away.

    (BTW folks, we're going to be doing a shooters trip to Moab the first week of Feb -- stay tuned for details in our workshop announcement forum )
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    I'll give you my 200 mm minolta as collateral . Lol
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Super Duper
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    Re: No love for the Mitakon 50 f0.95?

    Guy, you may as well order it now 'cause once you try it Jack will have to fight you for it back....
    Don Libby
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    Super Duper
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    Re: No love for the Mitakon 50 f0.95?

    It might not be my everyday lens but boy am I glad I have it in my bag. actually got the lens about a week before the 16-35 arrived then shortly afterwards I upgraded my IQ160 to a 180. Lots of new stuff to try and get used to and the 50 has been sitting neglected in my bag. From what little I've used this on my full spectrum A7 it really shines through all the IR filters I've used so far. I've got a minor project planned next week where this will be put to good use.

    Just left Moab last week and had a great combination of great cloudy skies, snow and fog mornings. And not a lot of people.
    Don Libby
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    Senior Member kdphotography's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Jack---did you start this thread for me?

    Don definitely. Guy maybe. But you? We expected more from you (the mature one). You sound like an enabler.

    I picked up the Sony 55mm for my son, but I still have my eye on the Mitakon Speedmaster II 50mm f/0.95. It's a lot of lens for the money.

    ken

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    Super Duper
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    Re: No love for the Mitakon 50 f0.95?

    I'll try and be as subtle as I can -

    Once you try the lens you'll want the lens...

    Remember when Jack told me to buy the Cube; that I wouldn't regret it? I bought the Cube and I haven't ever regretted it (ever notice how most our threads eventually include the Cube?).

    I bought the Motakon 50 f.95 and haven't retreated it..

    Just saying...

    p.s. Ken, Nick will like it too
    Don Libby
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    Re: No love for the Mitakon 50 f0.95?

    Just to help Guy and Ken out...

    Mitakon Speedmaster II "Dark Knight" 50mm F 0 95 Pro Ver M67 Sony E Mount New | eBay

    Get that last minute 179 expense in while you can.
    Don Libby
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    Re: No love for the Mitakon 50 f0.95?

    Don, Have you checked out the lens for IR hot spots?

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Cindy Flood View Post
    Don, Have you checked out the lens for IR hot spots?
    Cindy, yes but not all of them yet. So far I've shot with 590 and 830 with no indication. I'll try my other filter soon and report back.

    Don
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    Super Moderator Cindy Flood's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Thanks, Don.

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    Re: No love for the Mitakon 50 f0.95?

    ..hi..well, tempted i am indeed..

    ..BUT i have a canon 50/0.95 lying around that i also like alot..

    ..as i am planning to thin out the herd of equipment thats lying around and gets not much use and as i can sell the canon tv lens for a rather good price (sacrilege, i know ) i thought of selling it and buying the mitakon..

    ..of course the tv lens is kind of history and i am not sure if i want to part with it, but i could not get my mind up if the mitakon is better (sharper) wide open..

    ..anyone here who has experiences with both lenses..?

    ..thx in advance, erik..

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    Re: No love for the Mitakon 50 f0.95?

    Jack, you are evil! Pure evil!

    As I was packing up a bunch of lenses for Jono to play with, I started getting nostalgic about how I ended up getting each and every one You are responsible for both my first and last Leica lens (to date) -- both 50mm Summilux. The first was an old 1962 chrome one that I fell in love with at Camera West after trying out many. It is still achingly beautiful, but I hadn't realised that it had only 1M near focus. So when I finally looked to get another, I got the last version pre-asph (BP that, unfortunately, weighs a tonne) rather than the apsh all because of you! (You and that picture of dancing children at a wedding -- was it the flower girl and the ring bearer or something like that?)

    Meaning:

    I came SO close to picking up this lens after Jono suckered me into the A7s but then I looked at my bank account (and also realised I'd be out of the country and back in europe before it arrived )

    So, please, create lust, guys!
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    Senior Member pegelli's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    There is a long thread on Dyxum about this lens with many pictures and comparisons.

    Don't drool too much over the site guys, we like to keep it nice and tidy
    My Pics
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    Senior Member Tim's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    It certainly is Bokelishious (sorry I should not use that word)

    Some sample Flickr links. Note: I didn't take these pics so I am linking to outside this site to Flickr, so that you can see the photographer who deserves the credit..

    https://www.flickr.com/photos/wimary...-pUaH9f-p3HxRU

    This gives a interesting view of its focus isolation

    https://www.flickr.com/photos/photo-...-phWN9R-q1m4JG

    It seems very sharp when open wide too, not much softness there.
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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by psy501 View Post
    ..hi..well, tempted i am indeed..

    ..BUT i have a canon 50/0.95 lying around that i also like alot..

    ..as i am planning to thin out the herd of equipment thats lying around and gets not much use and as i can sell the canon tv lens for a rather good price (sacrilege, i know ) i thought of selling it and buying the mitakon..

    ..of course the tv lens is kind of history and i am not sure if i want to part with it, but i could not get my mind up if the mitakon is better (sharper) wide open..

    ..anyone here who has experiences with both lenses..?

    ..thx in advance, erik..
    I also have the Canon 50/0.95 and it isn't used much on the A7r or the NEX'(plastic mount). With the metal mounts in A7s and A7 II the scenario changes a bit.

    I am not in a rush. This thread also gives me lot of hope that I can buy an used lens in the very near future.
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    Senior Member RVB's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Here is a shootout between this lens and the Slr Magic hyper prime ..

    The 0.95 Shootout - Mitakon / Zhongyi Speedmaster 50/0.95 vs. SLR Magic HyperPrime CINE 50mm T0.95

    Rob
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    Senior Member MikeEvangelist's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    I hate you all - enablers!
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    Sr. Administrator Jack's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by cam View Post
    Jack, you are evil! Pure evil!

    As I was packing up a bunch of lenses for Jono to play with, I started getting nostalgic about how I ended up getting each and every one… You are responsible for both my first and last Leica lens (to date) -- both 50mm Summilux. The first was an old 1962 chrome one that I fell in love with at Camera West after trying out many. It is still achingly beautiful, but I hadn't realised that it had only 1M near focus. So when I finally looked to get another, I got the last version pre-asph (BP that, unfortunately, weighs a tonne) rather than the apsh all because of you! (You and that picture of dancing children at a wedding -- was it the flower girl and the ring bearer or something like that?)

    So, please, create lust, guys!
    Cam. Cam, Cam, Cam... Long story, sorry

    You will find it no surprise the whole reason I started down the A7r path was because of that lens!!! I gave it (and the M8/M9) up because I could no longer focus an RF as quickly or as accurately as I desired, especially at f1.4, so when EVF with focus peaking appeared my ears and eyes perked up and curiosity peaked, and I dreamed of being able to have it again and actually focus it! I went through a raft of 50's trying to replicate it on my Nikon to no real avail -- a lot of great 50's out there, but none as sweet as the pre-Lux to my eyes. But then the Sigma ART 50 arrived on scene, and of course I bought one in Nikon mount immediately. My 50 lust was (finally) appeased -- it is truly *almost* as nice rendering wide open as the pre-lux -- and seriously close enough from f2 up for me -- not to mention it AF's fast and accurately with Nikon's AF fine tune. Lust was now moderated enough I sold my Nikon 50/1.2 manual focus because I knew with the ART's AF and look, I'd never use it again -- if I was going to manually focus a lens, it needed to have very special character. (I still have my 85mm brass lantern focus Petzval lens for that reason )

    So now my lust for focus peaking is attenuated somewhat, but let's fast forward some more. I have what amounts basically to a "spare" Nikon D800e body that was used for one workshop, had under 1000 clicks on it, and was not getting used since I got my D810. A member tags me offline asking my honest opinion of the D810. I tell him and another very long story cut short, he indicates he has an A7r that isn't cutting it for his style of landscape work, and wishes he never sold his D800e, so we come to an arrangement -- -- and he ends up with a like new D800e and I end up with a gently used A7r. I immediately bought two Metabones adapters, Nikon of course, and Canon EF so I can use Guy's 24 TSE

    Now having the EVF with focus peaking, I start rethinking what lenses I can mount on it for their "look." Of course the pre-Lux comes to mind immediately, but as immediately the thought of actually being able to focus a Noctilux accurately wide open becomes compelling -- I did own multiple copies of the Noct (and even a few Canon 50/0.95's) when I had Leica M's and loved the look wide open, but could never focus them accurately enough to justify them; like I was lucky to hit on 1 out of 10. So the pre-Lux being better at f1.4 anyway and half the weight and cost of the Noct became my main squeeze. But now we've all seen Noct images in the A7r thread, so speed and paper-thin DoF come to the forefront of my thinking again.

    I start doing some searching and learn of the Mitakon. Look at all the online reviews with images and am actually impressed. I find out Don has one, and ask him about it -- he's only had it a short while but is really impressed, especially for the price. And while on the subject of price, for the cost of a good used pre-Lux I will just mention you can buy the Mitakon 50, a Nikon 28/1.4 ASPH and a Nikon 105/2 DC or a Zeiss 18 or 21, and still have money left over for a used A7r body!
    ~~~

    So without making this post so long nobody reads it, here is an image. I apologize as I have posted it in the fun with Sony A7 thread, but it got buried pretty quick. Nor is it as interesting a subject as the child ring-bearer and flower girl dancing (though those were at f4 IIRC -- see: http://www.getdpi.com/gallery/showimage.php?i=55&c=27), but it is a pretty decent exemplar image for this lens wide open I think. I focused on Mrs. Clause's glasses, right at the hinge on the frame and to my surprise I pretty much nailed it, though clearly I should have focused on her eyelashes! (But yeah for focus!) I think this image shows off the lens' strengths -- sharpness, fall-off (though I added another 2/3 stop vignette in C1), check out the oof speculars in the mirror behind them, overall Bokeh -- love the term "Bokelicious" Tim! -- and the overall balanced rendering. Pretty amazing for under $800...

    Mitakon Zhongyi 50mm f0.95 lens, handheld, ISO 200, 1/60th at f0.95; focus point on glasses frame is roughly 3 feet distant:



    Now the image looks pretty good at web size, but what about at actual pixels? Not too dang bad for an inexpensive (relatively) hyper fast lens, at least IMHO... Actual pixel crop as it came out of C1:



    Note that I've only had it and the A7r for about a week and am still learning the C1 parameters for it. That said, I had dialed back the C1 sharpening preset based on my eyes, and it is still slightly over-sharp so I will need to cut it back a bit more, but all that said, I think the image and the crop speak well to this lens' performance.

    PPS Note: There are TWO versions of this lens, so be careful about what you buy online, and/or other online images and reviews you might see. The newer lens has had some significant improvements and corrections for flare, resolution and CA. You can tell them apart by the filter size -- new = 67mm, old = 58mm.
    Jack
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    Re: No love for the Mitakon 50 f0.95?

    Jack, Jack, Jack, Jack, Jack!

    I love your stories! More, more, more!!!

    And I trust your gut for glass above most others. I mean, the ones you really really love. (I made my brother, just dipping his toes into FF shooting w/a D750, get the Sigma ART because of you.) So when you brought this thread up, I knew I may be going down a slippery slope, damn you!

    and merci

    Now go find a human for me, would you? (no offence to Mrs Claus)
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Lot of damn drooling over here. Might just have to mark this thread Ultimate GAS attack
    Photography is all about experimentation and without it you will never learn art.

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    Sr. Administrator Jack's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Guy, you might as well buy one now while they can be had in stock at reasonable prices. My guess is once the word gets out and more images get posted, they're going to become difficult to find in stock...

    Two more things FWIW: First is the aperture ring has no indents, stepless like a cine lens. Second is it does get a lot sharper stopped down even to f1.4 -- though I'll prolly be taping that stepless aperture ring at 0.95
    Jack
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    Re: No love for the Mitakon 50 f0.95?

    Guy, that's one of the reasons I included the link for the lens. When I brought mine off E-Bay it included a "Make Offer" which I did. I ended up dickering back and forth with Popflash but in the end I got the lens at what believe is a great deal. The more press this lens gets the sooner the price goes up and no more deals to be had.

    Let me know if you'd like to meet in Florance and I'll bring the lens so you can try it out sooner than Moab in Feb.

    don
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    I'm going to be about 50 miles from Popflash this week. You know how dangerous that is especially since I just bought a new Lincoln MKC. I'm in downtown LA and they are in Thousand Oaks I believe. Yea I know Tony well. Lol

    I needed a grandson transport. Actually it's my wife she insisted I get rid of my VW GTI and get a real vehicle. I was also forced to buy black. I keep trying to get away from looking like a mafia hit man. This does not help. Lol
    Photography is all about experimentation and without it you will never learn art.

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Guy Mancuso View Post
    I'm going to be about 50 miles from Popflash this week. You know how dangerous that is especially since I just bought a new Lincoln MKC. I'm in downtown LA and they are in Thousand Oaks I believe. Yea I know Tony well. Lol
    Buy it but have him ship it as it'll save on the taxes....
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    Re: No love for the Mitakon 50 f0.95?

    Tony (popflash) is where I got mine too -- Have him give you the lens and ship the box !
    Jack
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    "Perfection is not attainable. But if we chase perfection, we can catch excellence."
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    Re: No love for the Mitakon 50 f0.95?

    Enabler number 2 here. Lol
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: No love for the Mitakon 50 f0.95?

    I need to make money in LA first. Lol
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: No love for the Mitakon 50 f0.95?

    How do you think the Mitakon compares @f2 Vs. Loxia @f2 ?

    And if I was to use either for landscape, which one would outperform the other at each lens optimum f stop ?
    Alpa FPS MAX TC | Alpagon 32Hr | Helvetar 75 | Schneider 120N | Leaf Aptus II 5 Leaf Credo 60 | www.danlindberg.com

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    Re: No love for the Mitakon 50 f0.95?

    Has anyone compared this lens to a Nocti or the Canon FD 50mm L?

    I have a 50mm L here which is great, but it doesn't have an electronic mount so the A7R doesn't know what lens is mounted. Does the Mitakon? That would be a nice asset. [[[I see it doesn't have any electronic contacts... that's too bad, as that would be helpful for IS, once the cameras have it, which the a7II now has]]].

    The slightly shallower DOF would be nice too.

    It has a very slight bit of swirl to the bokeh that is reminiscent of some LF portrait lenses, and that can be used effectively with selective focus conditions.

    The lack of aperture detents is a problem, as I prefer to be able to make changes by feel rather than having to look.

    ---Michael
    Last edited by mjm6; 28th December 2014 at 13:11.
    a7r, a7rII, FE 16-35, FE 24-70GM, FE 70-200, Loxia 21mm, 35mm, 50mm

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    Sr. Administrator Jack's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    I've not shot a Loxia, and do not have ready access to a Canon 50/1.2L, so cannot comment. I will however shoot the Mitakon later this week at f5.6 and 8 and post the results. I can tell you that it sharpens up considerably at f1.4, so my guess is it will be pretty good at f5.6 and 8. I will try and compare my ART with it at the same time...
    Jack
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    Re: No love for the Mitakon 50 f0.95?

    Hi to all!

    I am a long time reader of the forums and I signed up finally. Popflash is also selling the Mitakon as demo and I got one looks like brand new though the rings are stiffer then the m/cv/zeiss lenses.

    FM forums has a post going on, but it is not active for a month or so after a couple fm'ers returned theirs for build quality issues:
    50mm F 0.95 Mitakon Sony E-Mount - FM Forums

    From FM posts, there is one link comparing it to Canon EF 50L and you can check the post:
    Speedmaster vs 50L -- Photography-on-the.net forums

    Here is my cat test shots with the A7R. It is hard to mf even with a small head turn (she didn't want to get photographed):



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  37. #37
    Senior Member MikeEvangelist's Avatar
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    Re: No love for the Mitakon 50 f0.95?

    Jack or Don, any sign of any parts loosening, as described in that FM thread? It's a bit disconcerting.

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    Re: No love for the Mitakon 50 f0.95?

    Mike, no problems or concern with the build quality of mine. I did post an short article on this lesson our blog shortly after getting it. Truth to told its been sitting in the bag having taken it out once at the So Rim last week. I plan on returning to it in a couple days and will post more samples then. I already said it but worth repeating, I like the lens and have no problems with it.

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    Re: No love for the Mitakon 50 f0.95?

    Mike I have not read that thread in a bit but they did revise this lens since it was brought to market and I think they are talking about the first version. Now they have a Pro version which is the one Don linked too.
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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by MikeEvangelist View Post
    Jack or Don, any sign of any parts loosening, as described in that FM thread? It's a bit disconcerting.
    I have not owned mine long enough to comment, but build quality seems superb. Perhaps these revised Pro ii models that Don and I own addressed some earlier issues?
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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Guy Mancuso View Post
    Mike I have not read that thread in a bit but they did revise this lens since it was brought to market and I think they are talking about the first version. Now they have a Pro version which is the one Don linked too.
    No Guy, they are talking about the Dark Knight version...

    It sounds like there are some teething problems with the lens, but that should be fixed (presumably by now? Hahaha).

    I'm going to look into in a bit more, but it may not be better/substantially different from the FD 50 1.2 L and 85 1.2 L that I have for shallow DOF shooting, and I don't think it is smaller than the 50mm, so it might be a bit of a trade rather than an improvement.


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    Re: No love for the Mitakon 50 f0.95?

    I'm not that ready to give up my ZA 50 1.4 either at least not without a head to head comparison. I'm pretty dang happy right now with my setup.
    Photography is all about experimentation and without it you will never learn art.

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Guy Mancuso View Post
    Mike I have not read that thread in a bit but they did revise this lens since it was brought to market and I think they are talking about the first version. Now they have a Pro version which is the one Don linked too.
    Actually, I'd really like to find one of the first versions… 58mm is much more to my liking.

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by serhan View Post
    Hi to all!

    I am a long time reader of the forums and I signed up finally. Popflash is also selling the Mitakon as demo and I got one looks like brand new though the rings are stiffer then the m/cv/zeiss lenses.

    FM forums has a post going on, but it is not active for a month or so after a couple fm'ers returned theirs for build quality issues:
    50mm F 0.95 Mitakon Sony E-Mount - FM Forums

    From FM posts, there is one link comparing it to Canon EF 50L and you can check the post:
    Speedmaster vs 50L -- Photography-on-the.net forums

    Here is my cat test shots with the A7R. It is hard to mf even with a small head turn (she didn't want to get photographed):
    It is fascinating that Canon EOS lenses are faster than the others with the same are even faster apertures. While I was checking the Speed Booster, I noticed this. The EF 50/1.8 II is faster (more light transmission) than the Zeiss Planar 50/1.4. The EF 50/1.4 is faster than an OM 50/1.2 and so on. I can easily believe that the 50/1.2 L is faster than the Zhongyi (Mitakon) 50/0.95.

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    Re: No love for the Mitakon 50 f0.95?

    Back in my Canon days, I owned the 50/1.2 L. It wasn't that impressive to me, and in fact I bought a Sigma 50/1 .4 (and not an ART back then) and was so much more pleased with it I immediately sold the 50L. I could have had a bad copy, but at the time recall most being underwhelmed by it. Perhaps it's better now, I don't know.

    Vivek, as I'm sure you no doubt already know, "aperture" is different than light transmission as multiple things affect net transmission, while two distinct physical measurements determine aperture; focal length divided by iris width. While aperture is related to any given lens' ability to transmit, it is not an absolute definition of it. Here is why cine lenses use "T" stop designations, which is simply the aperture adjusted for that particular lens' light transmission factors, all in effort to give a net real transmission value. This discussion is of course complicated by optical speed boosters that manipulate optical physics by adding yet more light-stealing glass elements, reducing focal length and maintaining iris width, and thus increasing "aperture." These do not always result in additional light transmission either, though by the physical definition, do increase the "f-stop" speed

    Moreover, it's important to note that most modern SLR lenses fair very well here, having their "f-stop" rating only slightly reduced for actual "T-stop" number, usually on the order of 0.1 point of loss for lenses in the 24 to 85 range. And here, Canon fares no better than Nikon or Sony or Zeiss. Thus I am skeptical of any claim of C having superior light transmission for a given aperture than other contemporary glass -- perhaps you can provide some links that conclusively support and explain this? (My guess before even seeing them is lens flare was not taken into account, and any old time LF shooter can tell you that old uncoated lenses often need a little less exposure than a modern multicoated lens because of the effects of flare on overall exposure. And here, the Canon 50L is a relatively older design and coating than Nikon's Nano-Crystal "moth-eye" or Sigma's revised ART coatings for example...)
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    Re: No love for the Mitakon 50 f0.95?

    Lens porn from this morning

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Don Libby View Post
    Lens porn from this morning
    Interesting. The Mitakon is definitely larger than I imagined it to be.

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    Re: No love for the Mitakon 50 f0.95?

    Here's a couple samples from the night I got the lens.

    Can't complain about the packaging ..



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    I had a Voigtlander Nokton 50mm f/1.1 back in my Leica M9 days and had thought about getting another for the Sony. All things considered, while the Nokton is good, I'm glad I went with the Speedmaster.
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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by MikeEvangelist View Post
    Interesting. The Mitakon is definitely larger than I imagined it to be.
    It weights more than either of the other lens yet is smaller. Personally, I find the weight of the 50 nice.

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    Re: No love for the Mitakon 50 f0.95?

    Quote Originally Posted by Jack View Post
    Back in my Canon days, I owned the 50/1.2 L. It wasn't that impressive to me, and in fact I bought a Sigma 50/1 .4 (and not an ART back then) and was so much more pleased with it I immediately sold the 50L. I could have had a bad copy, but at the time recall most being underwhelmed by it. Perhaps it's better now, I don't know.

    Vivek, as I'm sure you no doubt already know, "aperture" is different than light transmission as multiple things affect net transmission, while two distinct physical measurements determine aperture; focal length divided by iris width. While aperture is related to any given lens' ability to transmit, it is not an absolute definition of it. Here is why cine lenses use "T" stop designations, which is simply the aperture adjusted for that particular lens' light transmission factors, all in effort to give a net real transmission value. This discussion is of course complicated by optical speed boosters that manipulate optical physics by adding yet more light-stealing glass elements, reducing focal length and maintaining iris width, and thus increasing "aperture." These do not always result in additional light transmission either, though by the physical definition, do increase the "f-stop" speed

    Moreover, it's important to note that most modern SLR lenses fair very well here, having their "f-stop" rating only slightly reduced for actual "T-stop" number, usually on the order of 0.1 point of loss for lenses in the 24 to 85 range. And here, Canon fares no better than Nikon or Sony or Zeiss. Thus I am skeptical of any claim of C having superior light transmission for a given aperture than other contemporary glass -- perhaps you can provide some links that conclusively support and explain this? (My guess before even seeing them is lens flare was not taken into account, and any old time LF shooter can tell you that old uncoated lenses often need a little less exposure than a modern multicoated lens because of the effects of flare on overall exposure. And here, the Canon 50L is a relatively older design and coating than Nikon's Nano-Crystal "moth-eye" or Sigma's revised ART coatings for example...)
    Agree with what you say about T vs F stop scales, Jack. However, we are discussing the T value (forget the Speed Booster and the added complications from it). The links from Serhan also add to this (The Noct 50/0.95 is about 0.2eV faster than the Mitakon 50/0.95 and the second link- the EF 50/1.2 is faster than the 50/0.95). I only find this only academic in nature and interest and nothing more.

    (PS: Let us not forget that only with the FF A7 series, such comparisons of lenses across the systems is possible. There was no other system except the EOS to mount and use the Canon lenses before the A7)

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