08-13-2010, 11:22 AM
[quote name='Rainer' timestamp='1281697525' post='1735']
Besides using the lens at different apertures and thoroughly inspecting the results you mean?
Probably the easiest thing to do is to stop down 2-3 stops (but no more than f/8 on crop-1.6 and
f/11 on fullframe) and trust in the old rule, that lenses gain quality when stopped down.
Franky, I would't worry too much about it ... as already said, there are more important
factors that using the lens at the stop with maximum performance.
Just my 2cts ... Rainer
[/quote]
All those questions arose, when on of the guy want to test his Sigma 50mm F1.4 and came complaining that it is not sharp enough on his EOS 7D.
Finally with some MA he can able to produce some image with different F which are considerably sharper then his previous post, and with that I was wondering is there any handy method to test the sharpness in case of calibration(from company) and MA.
I normally trade-off between bokeh and sharpness with my EF 50mm F1.4 on a 1.6x body till now I have no complaints with the existing gear.
Besides using the lens at different apertures and thoroughly inspecting the results you mean?
Probably the easiest thing to do is to stop down 2-3 stops (but no more than f/8 on crop-1.6 and
f/11 on fullframe) and trust in the old rule, that lenses gain quality when stopped down.
Franky, I would't worry too much about it ... as already said, there are more important
factors that using the lens at the stop with maximum performance.
Just my 2cts ... Rainer
[/quote]
All those questions arose, when on of the guy want to test his Sigma 50mm F1.4 and came complaining that it is not sharp enough on his EOS 7D.
Finally with some MA he can able to produce some image with different F which are considerably sharper then his previous post, and with that I was wondering is there any handy method to test the sharpness in case of calibration(from company) and MA.
I normally trade-off between bokeh and sharpness with my EF 50mm F1.4 on a 1.6x body till now I have no complaints with the existing gear.