[quote name='Klaus' timestamp='1333309435' post='17265']
The lens quality of this sample seems to be terrible ...
[/quote]
Have a look at the Zeiss published MTF: applications.zeiss.com/C12578B8004E8E1D/0/C8631910991DACC7C12579C300289E1B/$file/distagon_28_15.pdf
In the corners that doesn't seem capable of resolving much more than 40 lpmm for tangential structures. If I got the factors of two in the right place, 40 lpmm on a FF corresponds to a resolution of 1900 lines per image height. That is a blur of 2 pixel on that Canon. I am not sure we are seeing any worse than this. On the other hand, if you look in the centre, this animal is biting sharp there. Which is also what the MTF is showing.
In summary I am not sure this sample is out of line with the MTF curve.
I think the sample images they took are not so well chosen to assess lens quality.
J.
The lens quality of this sample seems to be terrible ...
[/quote]
Have a look at the Zeiss published MTF: applications.zeiss.com/C12578B8004E8E1D/0/C8631910991DACC7C12579C300289E1B/$file/distagon_28_15.pdf
In the corners that doesn't seem capable of resolving much more than 40 lpmm for tangential structures. If I got the factors of two in the right place, 40 lpmm on a FF corresponds to a resolution of 1900 lines per image height. That is a blur of 2 pixel on that Canon. I am not sure we are seeing any worse than this. On the other hand, if you look in the centre, this animal is biting sharp there. Which is also what the MTF is showing.
In summary I am not sure this sample is out of line with the MTF curve.
I think the sample images they took are not so well chosen to assess lens quality.
J.
enjoy