andersd wrote:
Fred Miranda wrote
andersd wrote
I was using this lens for about a year on the Sony A7rII, along with a Novoflex adapter and a Optosigma PCX 5000 filter. After much consideration I recently traded in the Sony for a Leica M-P (typ 240), and I am absolutely blown away with the image quality of the Distagon on the Leica. Infinity focus is located exactly at the hard stop, and landscapes are acceptable (to me) already at an aperture value of 1.4. At this aperture, there is only a slight sharpness falloff from the center. This level of detail required stopping down to about f/4 on the Sony with the PCX filter. Of course, the lower pixel density of 24 MP helps with the apparent resolution. However, this is still a fantastic optic, and the Leica brings out the best of it.
For Sony shooters, I sincerely hope that Zeiss makes a version which natively designed for the Sony flange distance and cover glass, in order to get the best of this optical formula. How about the mid-field? When I used the ZM 35/1.4 + 5m on the Sony, there was a noticeable resolution dip towards the mid-field. Do you see that on the Leica? I always thought this was induced by the PCX. The derogatory effect of the PCX filter on the midfield is exactly what Bastian's infinity tests showed in the review at phillipreeve.net. However, a dip in this zone of the highest frequencies is inherent to the design independent of the sensor, as shown in the official Zeiss MTF charts. In practice, I find this dip absolutely acceptable, as I believe it is introduced to increase performance in the far corners.
Yes, that dip shown on the Zeiss MTF is perfectly acceptable imo. As you wrote it's a lens characteristic but I believe the PCX amplifies the issue. For the Sony sensor stack, I got better results at mid-area when removing the PCX and focusing on that area.