rscheffler Offline Upload & Sell: Off
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jcolwell wrote:
Not yet, but it's good to hear about your preliminary results. I occasionally use some LTM lenses on my M5 and M6, but they're not the same at 1.6x CF. I expect my CV 15/4.5 might suffer 'edge effects' on a modern FF R-series camera, but the CV 25/4 could be OK. I really look forward to using my old Canon S LTM lenses on a modern FF camera; 35/2, 50/1.4 II, and 100/3.5 III. They should be excellent (and they're stupidly small). Anyway, I'll watch this thread with great interest.
As an aside, I tested a bunch of my M and LTM mount lenses on the M6II and none of them were sharper across the frame than the 'cheap' Canon EF-M primes. My $3K Leica 21/3.4 didn't hold up into the corners as well as the Canon 22/2. But on Leica FF it's very sharp, so I would expect this to be a problem of too thick sensor cover glass. The Canon 32/1.4 was sharper than my Leica 50/1.4 ASPH on the M6II, but the Leica had better control over colour fringing/blooming in high contrast transitions. But it sounds like the more recent Canon FF mirrorless have fairly thin cover glass, which is promising.
I have the Canon 35/2 and 50/1.4 LTM lenses, too, but only use them on the Leica (don't yet have a Canon FF mirrorless). I agree, stopped down they're really good across the frame. Being older designs though, I wonder if at least the 35/2 might result in some color shift with certain sensor types due to the sort exit pupil distance. This could also be the case with your Voigtlander 25/4. The 15/4.5, if it's the latest version, should do OK, because even the M mount version is as good on a Sony sensor as it is on a Leica. The problem with the 15 was copy variation (there was a pretty long thread about it on the Alt board a few years back), where a lot of copies didn't hold up well into the extreme corners. The previous design, whether in LTM or M mount (optics are the same), definitely can cause edge color shift, depending on the sensor design (BSI being preferable).
Eventually I'll go Canon FF mirrorless and I'll test everything M and LTM mount I have on it. Might start with the R7 though, but that too would be interesting to use with the small rangefinder lenses to better match the size of the camera. Given it's pretty much the same sensor as the M6II/90D, I doubt the rangefinder glass will perform better, but perhaps across-frame sharpness will be if it has a thinner cover glass than the M6II. It could also be that 32MP APS-C more easily reveals minor deficiencies that wouldn't be noticeable at half the resolution.
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