Sigma 28-70 EX DG lens does not get a crisp focus on autofocus most of the time. Can improve it with manual slightly better sometimes. I use it on a Canon 1D Mark IIn. By comparison, my L series 100-400 is remarkable. Is there a way for me to calibrate it for my camera? Thanks
Cameras - Sigma - 28-70mm f/2.8 EX DG for Canon EOS
Answers & Comments
No you will have to send to a sigma for recalibration