peterv Posted April 24, 2014 Share #1  Posted April 24, 2014 Advertisement (gone after registration) First let me say I really like the new T system.  I was wondering if anyone knows:  - flange focal distance - diameter of the throat of the lens mount  Looking at some pictures and videos, at seams quite wide, which is a good thing and was expected, to be able to make telecentric lenses. Now I don't want to open up a can of worms, but it seems to me the T-Mount could be so called full frame ready. For sure, Leica likes to keep their options open, like Sony did with their - smaller - E-Mount. Link to post Share on other sites More sharing options...
Advertisement Posted April 24, 2014 Posted April 24, 2014 Hi peterv, Take a look here T Mount. I'm sure you'll find what you were looking for!
Lightwrangler Posted April 24, 2014 Share #2  Posted April 24, 2014 - diameter of the throat of the lens mount  According to Jono Slack it's about 50mm in diameter. Definitely bigger then E-mount and probably FF suited.  Jono writes:  "Just as a little aside, the Leica T mount is noticeably larger than the Sony E mount (my casual measurement has the Sony at 46mm and the Leica T at 50mm). . . . I’ve not even discussed this with Leica, but I really see no reason why they couldn’t make a full frame camera later on with the same mount."  Mike Link to post Share on other sites More sharing options...
doolittle Posted April 24, 2014 Share #3 Â Posted April 24, 2014 Ming Thein's write-up says it is about the size of Canon's EOS mount. jono Slack writes it is about 50mm, wider than Sony's E mount. Link to post Share on other sites More sharing options...
fuchs Posted April 27, 2014 Share #4 Â Posted April 27, 2014 Hi.How about flange distance? Are the lenses manually focusing or controlling aperture by wire or are they mechanical? Perhaps it would be interesting to mount the 23mm Summicron to an X-Fuji or a Sony body. Link to post Share on other sites More sharing options...
mjh Posted April 27, 2014 Share #5  Posted April 27, 2014 According to Jono Slack it's about 50mm in diameter. Definitely bigger then E-mount and probably FF suited. ‘FF suited’ by the old-style rules relevant for analog SLRs and rangefinder cameras, namely that the throat size would have to be just a little larger than the image circle. The rules for modern mirrorless systems with a very short flange distance are different; the ideal throat size is assumed to be 100 percent (or at least 50 percent) larger than the image circle. The large throat size is not meant to fit a large sensor, but a large rear lens. Link to post Share on other sites More sharing options...
luigi bertolotti Posted April 27, 2014 Share #6 Â Posted April 27, 2014 Hi.How about flange distance? Are the lenses manually focusing or controlling aperture by wire or are they mechanical? Perhaps it would be interesting to mount the 23mm Summicron to an X-Fuji or a Sony body.[/quote]Â Interesting by sure, as well as impossible by sure... Link to post Share on other sites More sharing options...
fuchs Posted April 27, 2014 Share #7 Â Posted April 27, 2014 Advertisement (gone after registration) Hi.How about flange distance? Are the lenses manually focusing or controlling aperture by wire or are they mechanical? Perhaps it would be interesting to mount the 23mm Summicron to an X-Fuji or a Sony body.[/quote]Â Interesting by sure, as well as impossible by sure... Â Ciao Luigi, why do you think so? I mean, if focusing and aperture are mechanically controlled by the corresponding rings, AND the flange to mount distance allows it, an adapter ring to mount Leica T lenses on other mirrorless bodies is possible. Â Merely looking at the press release pictures though, it looks the T flange distance is even shorter than the Fuji X's or Sony E's, but I wanted to know... Link to post Share on other sites More sharing options...
luigi bertolotti Posted April 27, 2014 Share #8 Â Posted April 27, 2014 It seems to me that both aperture and focusing are activated by contacts... focusing can be manual... but one cannot renounce to activate the diaphragm. Link to post Share on other sites More sharing options...
peterv Posted April 28, 2014 Author Share #9  Posted April 28, 2014 ‘FF suited’ by the old-style rules relevant for analog SLRs and rangefinder cameras, namely that the throat size would have to be just a little larger than the image circle. The rules for modern mirrorless systems with a very short flange distance are different; the ideal throat size is assumed to be 100 percent (or at least 50 percent) larger than the image circle. The large throat size is not meant to fit a large sensor, but a large rear lens.  Hi Micheal,  thanks for your reply. In one of the T rumour threads you made some comments along these lines and I think it makes a lot of sense. Does this mean that Sony E-mount is forever crippled now that they've expanded to so called FF? I find it difficult to believe that Sony engineers didn't think of this while designing their E-mount. Link to post Share on other sites More sharing options...
mjh Posted April 28, 2014 Share #10  Posted April 28, 2014 Does this mean that Sony E-mount is forever crippled now that they've expanded to so called FF? I find it difficult to believe that Sony engineers didn't think of this while designing their E-mount. Sony had a problem on their hands, namely how to converge their NEX and Alpha camera lines. Alpha was derived from Minolta’s 35 mm SLR system but also supported APS-C while the mirrorless NEX system was APS-C. The future system would obviously be mirrorless, that much was certain, so it would resemble NEX rather than Alpha, but Sony also needed to retain the 35 mm option of the Alpha system. So they decided to cram a 35 mm sensor into the NEX system, rename it ‘Alpha’, and hope for the best. It would be interesting to compare this solution to an EVIL system designed for 35 mm from the ground up, but such a system doesn’t yet exist. (And who knows, we might get an EVIL MF camera before an EVIL 35 mm one.) Link to post Share on other sites More sharing options...
3D-Kraft.com Posted April 28, 2014 Share #11  Posted April 28, 2014 Jono writes: "Just as a little aside, the Leica T mount is noticeably larger than the Sony E mount (my casual measurement has the Sony at 46mm and the Leica T at 50mm). . . . I’ve not even discussed this with Leica, but I really see no reason why they couldn’t make a full frame camera later on with the same mount."  I would go one step beyond: In my opinion, the T-mount was designed from scratch exactly with that option in mind.  The days of M-mount are (in my opinion) counted and it would make much more sense for Leica to continue with the same mount for APS-C and FF sensors like Sony, Canon and Nikon did as well.  Hi Micheal, thanks for your reply. In one of the T rumour threads you made some comments along these lines and I think it makes a lot of sense. Does this mean that Sony E-mount is forever crippled now that they've expanded to so called FF? I find it difficult to believe that Sony engineers didn't think of this while designing their E-mount.  We had a quite intensive discussion about that topic already in another thread before the A7/A7R appeared.  In my opinion, in our days the dimension of a mount is always a compromise between compactness and keeping options open. The mount, that Michael describes, keeps all options open (even for lenses with monstrous rear elements) but would result in camera bodies that propably would be not too popular for a broader market. Sony decided to prioritize compactness and so forces more complex lens designs. On the other hand, I am quite sure that Zeiss will master the challenge to design an UWA zoom for FE that performs about as well as the Leica WATE on an A7 / A7R. Future sensors (e.g. organic sensors) will be less demanding and less problematic regarding symmetric lens designs anyway. Link to post Share on other sites More sharing options...
k-hawinkler Posted August 27, 2014 Share #12 Â Posted August 27, 2014 So, is the flange focal distance known? Link to post Share on other sites More sharing options...
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