i thought my 400 F5.6 is not sharp. however, i could be totally wrong or can not handle it.
this picture is taken by 5ds II with 1.4 III TC, on 161MK2B tripod.
mirror up with wireless remote shutter.
only been sharpened in raw and converted by DPP with quality setting of 10, resize to 1024.
second one should be native without TC, hand hold with 30D.
please make your judgment, what am i suppose to do to make it sharper?
very appreciated for your kindly input