[Guest]

I've been wondering if the flatness of the focal plane is going to affect the corner resolution readings for these ultra wide lens tests. In another word, is the wide open corner softness more or less caused by off-focus corners while the center is in-focus? I don't believe the focal plane for ultra wides could be absolutely flat to allow both the center and the corner of the testing board to be infocus at the same time.



Regards,

james