Want-a-leica Posted December 19, 2010 Share #1 Â Posted December 19, 2010 Advertisement (gone after registration) I just got an adaptor for my Canon EOS 1D MK3 so I can use R lenses with it. I played around with a few of them in a local camera shop and I like what I saw. The thing I haven't worked out yet is that why my camera shows a permanent aperture reading of 1.4 for any lens I mount. This adaptor does have a focus confirmation chip on it, which lets me know when it's in focus, but I still don't get it. I tried a 2.8 lens and a 4, and they both showed up as 1.4. Not that it seems to make any difference to the images I got with it (which were really nice...I definitely think I'm going to get a few second hand R lenses to start with and see how it goes from there), but just wondering if anyone can unravel this little mystery. Link to post Share on other sites More sharing options...
Advertisement Posted December 19, 2010 Posted December 19, 2010 Hi Want-a-leica, Take a look here Using R Lenses on DSLR. I'm sure you'll find what you were looking for!
andybarton Posted December 19, 2010 Share #2 Â Posted December 19, 2010 The camera has no way of knowing what sort of lens is mounted. Link to post Share on other sites More sharing options...
Want-a-leica Posted December 19, 2010 Author Share #3 Â Posted December 19, 2010 The camera has no way of knowing what sort of lens is mounted. Â Yeah, I know. Apart from the focus confirmation chip, there's essentially no communication between camera and lens. The thing that I was curious about is why it indicates 1.4. Why not 1.2 or 1.8? Can't be that 1.4 is the lowest number it recognizes, because Canon make lenses at 1.2 and (rarely) lower. Â Not a big deal, either way. Link to post Share on other sites More sharing options...
wildlightphoto Posted December 19, 2010 Share #4  Posted December 19, 2010 Yeah, I know. Apart from the focus confirmation chip, there's essentially no communication between camera and lens. The thing that I was curious about is why it indicates 1.4. Why not 1.2 or 1.8? Can't be that 1.4 is the lowest number it recognizes, because Canon make lenses at 1.2 and (rarely) lower. Not a big deal, either way.  Could be the adapter's chip is set for f/1.4 Link to post Share on other sites More sharing options...
lct Posted December 19, 2010 Share #5 Â Posted December 19, 2010 Or depends upon the body. My 5D1 says f/1.8 with two different adapters. Link to post Share on other sites More sharing options...
adan Posted December 20, 2010 Share #6 Â Posted December 20, 2010 With my unchipped R/EOS adapter, my Canon reports every lens as "50mm" - with NO aperture setting listed. Â Presumably the Canon engineers picked 50mm as the "default option" for when the camera recognizes no lens attached. Either they also picked f/1.4 as the default aperture (as Leica picked "f/1.0"), or as Wildlight says, that is how your chipped adapter is coded. Â Put another way - what SHOULD the camera tell you if it has no idea what the max. aperture or shooting aperture really is? f/16? f/0? Link to post Share on other sites More sharing options...
etp095 Posted December 20, 2010 Share #7 Â Posted December 20, 2010 Advertisement (gone after registration) just wondering if canon is the only brand that could use the leica R lenses,i'm patial to nikon for my dslr/slr cameras? Link to post Share on other sites More sharing options...
adan Posted December 20, 2010 Share #8  Posted December 20, 2010 just wondering if canon is the only brand that could use the leica R lenses,i'm patial to nikon for my dslr/slr cameras?  Putting R lenses on Nikons requires a full mount transplant involving screwdrivers and such. There is no room to put an adapter between the lens and the camera quickly and temporarily (as there is with Canon bodies) without losing focusing to infinity. Once converted, they seem to work just as well, according to the users here.  Leica lens for Nikon cameras  Sony Alphas also require surgery rather than just a bayonet-on/off adapter, apparently: Convert Leica R to Sony Service - AlphaMountWorld.com  Me, I preferred the Canon 5D2 route: only FF SLR that delivers 20+ Mpixels under $6,000 (and under 900 grams) and accepts Leica R lenses without a toolbox, and can be fitted with an OEM split-image focusing screen (ex Haoda). Link to post Share on other sites More sharing options...
andybarton Posted December 20, 2010 Share #9 Â Posted December 20, 2010 I am very pleased with my R glass on a Nikon D700 using Leitax mounts. Leitax make mounts for Sony's too. Â Conversion takes about 5 minutes. Link to post Share on other sites More sharing options...
RPS Posted December 20, 2010 Share #10 Â Posted December 20, 2010 I am very pleased with my R glass on a Nikon D700 using Leitax mounts. Conversion takes about 5 minutes. Â +1 Link to post Share on other sites More sharing options...
integrale Posted December 20, 2010 Share #11 Â Posted December 20, 2010 I am very pleased with my R glass on a Nikon D700 using Leitax mounts. Leitax make mounts for Sony's too. Â Conversion takes about 5 minutes. Â +2 Link to post Share on other sites More sharing options...
farnz Posted December 22, 2010 Share #12 Â Posted December 22, 2010 just wondering if canon is the only brand that could use the leica R lenses,i'm patial to nikon for my dslr/slr cameras? The Sigma SD14 can have its lens mount modified to take R lenses; Sigma Cum Laude will supply the camera new with the R mount pre-installed or supply the mount for you to install on your own SD14. Â The benefit of this system is that you get to use R lenses with the Foveon sensor. Â Pete. Link to post Share on other sites More sharing options...
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