I have this combo in the title, and after reading some excellent reviews i was a little surprised at the less than stellar IQ at the long end. I was out recently capturing some Cormorants and when i got home and viewed the files, they were blurred when viewed even at 50%. Lens was on a carbon tripod, AF, ISO 800 , F6.3, distance around 75ft, SS was over 1000th. I use LLT too
I decided to check AF fine tune, and set the lens up on the same tripod at home, looking at a non moving subject, around 90ft away, using MF and Live view, LLT , F5.6 @ 800mm ISO 800, and getting SS of around 1000th. Took a snap, then immediately switched to AF and took another and compared shots.
Live view / MF shot was significantly better than the AF shot, so figured some AF fine tuning might help , even though i didnt see any front or back focus problems. But i didnt get any better shots after adjusting the fine tune in both directions.
Could there be a lens problem at the long end on the Sigma ? I will be doing another test tomorrow and hope that the weather improves and then can upload some samples
I decided to check AF fine tune, and set the lens up on the same tripod at home, looking at a non moving subject, around 90ft away, using MF and Live view, LLT , F5.6 @ 800mm ISO 800, and getting SS of around 1000th. Took a snap, then immediately switched to AF and took another and compared shots.
Live view / MF shot was significantly better than the AF shot, so figured some AF fine tuning might help , even though i didnt see any front or back focus problems. But i didnt get any better shots after adjusting the fine tune in both directions.
Could there be a lens problem at the long end on the Sigma ? I will be doing another test tomorrow and hope that the weather improves and then can upload some samples