[quote name='ogl69' timestamp='1337532114' post='18355']
AA filter characteristic which may explain at least part of the results.
AA filter could affect only at sharpness and WHOLE resolution of system, which 2750 LW/PH for K-5. AA filter has no any affect at the drop of resolution of lens at 16 MP vs 10 MP. Klaus, it's strange to hear such explanation from you.
[/quote]
Maybe I have a better insight then ?![[Image: wink.gif]](http://forum.photozone.de/public/style_emoticons/default/wink.gif)
We measure the MTFs at quadrant transitions - at the borders / corners the edges of the quadrants are slightly aligned to the sagittally and tangentially resolution respectively (not on purpose). If a lens suffers from astigmatism these resolution types will differ.
On a symmetrical AA filter the measured results are just averaged whereas an asymmetrical one favors one resolution type at the quadrants - not much, of course, but there is a certain tendency.
AA filter characteristic which may explain at least part of the results.
AA filter could affect only at sharpness and WHOLE resolution of system, which 2750 LW/PH for K-5. AA filter has no any affect at the drop of resolution of lens at 16 MP vs 10 MP. Klaus, it's strange to hear such explanation from you.
[/quote]
Maybe I have a better insight then ?
We measure the MTFs at quadrant transitions - at the borders / corners the edges of the quadrants are slightly aligned to the sagittally and tangentially resolution respectively (not on purpose). If a lens suffers from astigmatism these resolution types will differ.
On a symmetrical AA filter the measured results are just averaged whereas an asymmetrical one favors one resolution type at the quadrants - not much, of course, but there is a certain tendency.