[jerome]

Having just acquired a NEX 7 to replace my NEX 5 (not 5N, the original 5), I decided to compare the two cameras on various lenses to determine whether I could see the difference in corner sharpness. I use a distant tree as test picture (using an object really far away minimizes alignment errors).



Since I don't have any other NEX lens than the 16mm, which has poor corner sharpness, I used the LA-EA1 adapter and the following lenses:

-the CZ 24mm f/2.0

-the 35mm f/1.4 G

-the CZ 24-70 f/2.8 at 50mm



I tried different lenses and different apertures, because if we have a sensor problem the result will depend on the incident angle of the corner rays and that angle depends on lens design and aperture.



For the comparison, I publish the extreme lower right corner (the lower right corner of the crop is the lower right corner of each image). The image from the NEX 7 is resampled to match the one of the NEX 5.



Warning: large downloads below:



These are the results for the CZ 24mm f/2.0:

http://www.flickr.com/photos/jerome_munich/6969236181/sizes/o



These are for the 35mm f/1.4 G:

http://www.flickr.com/photos/jerome_munich/6823112164/sizes/o



These are for the CZ 24-70 f/2.8 zoom at 50mm:

http://www.flickr.com/photos/jerome_munich/6969236431/sizes/o



The original pictures are under:

www.flickr.com/photos/jerome_munich/sets/72157629188152922/detail/



The lenses do not all have sharp corners (notably the CZ 24mm prime) but I do not see that the results are vastly different between the two cameras. So I am not entirely sure that I understand what the problem is. Is the problem limited to rangefinder lenses? Or is the problem only detectable with MTF measurements?