@jj1804 in case you haven't seen it, though there is not much to see, Canon Japan has a couple very low resolution sample photos online at this page, which I've embedded below.
@RustyRus as a fellow Leica shooter, I think you're familiar with the decreased blur towards the image corners that @comotionfilms does not like, given how common it is with wider rangefinder system lenses. I tried to explain it to the best of my layman's abilities in the 35 VCM thread, which you may have seen. Basically, high optical vignetting means that light rays forming the peripheral parts of the image effectively pass through a smaller maximum aperture opening than on-axis light rays. Smaller effective aperture means more depth of field in that portion of the image. The wider the lens, the more a 2-3 stop light transmission difference will affect apparent depth of field across the image in the out of focus background. In the image above, the cable and palm branch at the top left are sharp, which are probably close to the plane of the subjects, so I don't think it's traditional field curvature causing this (or only traditional FC). That said, the 35's MTFs suggest that the notable divergence of sagittal and tangential planes towards the image periphery might mean one of the two planes does have field curvature and will increase apparent sharpness away from the intended flat plane of focus.
Based on the 50 VCM samples, it does not appear to be noticeably affected by the problem of sharper background corners, though the samples are also not torture tests for revealing this effect.
@jj1804 in case you haven't seen it, though there is not much to see, Canon Japan has a couple very low resolution sample photos online at this page, which I've embedded below.
@RustyRus as a fellow Leica shooter, I think you're familiar with the decreased blur towards the image corners that @comotionfilms does not like. I tried to explain it to the best of my layman's abilities in the 35 VCM thread, which you probably saw. Basically, high optical vignetting means that light rays forming the peripheral parts of the image effectively pass through a smaller maximum aperture opening than on-axis light rays. Smaller effective aperture means more depth of field in that portion of the image. The wider the lens, the more a 2-3 stop light transmission difference will affect apparent depth of field across the image in the out of focus background. In the image above, the cable and palm branch at the top left are sharp, which are probably close to the plane of the subjects, so I don't think it's traditional field curvature causing this. That said, the 35's MTFs suggest that the divergence of the saggital and tangential planes towards the image periphery might mean one of the two planes does have field curvature and will increase apparent sharpness away from the intended flat plane of focus.
Based on the 50 VCM samples, it does not appear to be noticeably affected by this problem, though the samples are also not torture tests for revealing this effect.
