Originally posted by ogl It's absurd. Even Klaus can't explain it now. By the way, he had a lot of bad copies of lenses of any brands. No any surprise.
Do you understand the SIMPLE FACT - ANY LENS of ANY brand will have HIGHER resolution at the camera with higher MP.
It's pure mathematics tests of lenses. Klaus uses IMATEST.
The resolution of system camera+lens+soft are always higher with higher MP. If there is any strange results like with FA43, it means - there is any problem with lens.
Have a look at the DA18-55, for example. All Pentax lenses tested at K-5 have higher resolution than at K10D.
Except for corners of FA43. Pay attention - FA43 is MUCH better resolution at f1.9 at the center than at K10D.
MUCH BETTER.
This test shows only one thing - Klaus has the sample with very good center and bad corners.
Nevertheless, you cannot only say a lens is supposed to be good at the center.
It is not the first time, when sensor gets higher resolution, some lenses sho weakness in their borders.
I can admit it for a lens such as the 50mm FA f/:1.4, because the price is reasonnable.
Not for the 43mm.
And now, it is only the border of the aps-c size. Imagine for the border of a FF sensor.
If what I say is so wrong, why so much nikon users of D800 complain about their 24-70mm f/:2.8 AFS...?
A film lens does not care about the angle of incidence of a light ray, a sensor does...
If Pentax makes a FF, remaking 28-70mm f2.8 and 80-200mm f2.8 cannot be a qualitative answer.
Just look at the 35mm DA, there is something called ghostless treatement... Is it so unusefull ?