testshots today with Sigma EX300-800 f5.6 apo dg
shots taken with
Canon 50D, 1:125, f14, ISO 500
tell me what you think...
Overall corrections has not been made, only brightness raised +1
I usually shoot -1.
Shots taken at about 300, 400, 500,640 and 800mm to compare sharpness and magnif.