I have been having problems with my A700 since last summer with out of focus shots that i would have swore were virtually unmissable! (well almost)
So after some home tests i found i had slight back focus which i adjusted myself, and all seemed well and good, but i had been shooting mainly at close ranges and usually with a smaller aperture.
Then with my Sigma 120-400mm HSM i was getting very mixed results, some pin sharp some so out of focus all i got was mush ! Was it camera shake, i really dont think so i was using shutter speeds upto and over 1/1000 with same results. The last failure was the last straw.Four deer crossing a field 50yards in front of me, walking i might add. Nothing behind them but sky (was an incline) not a single shot in focus using my manfrotto monopod.
Today i went out my pretty solid Video Tripod mounted lens to tripod (Sigma 120-400mm HSM) 2sec mlu with virtually all shots slightly off, this is where i noticed that some of the shots appar to be sharper on the top 3/4 right hand side of virtually all the shots? Then i remembered a shot i did at my brothers wedding where the left was oof while the right side seemed fine.
Could the 3 Hex screws have vibrated loose after i did the AF adjustment or is there an alignment issue with my sensor?
The included shots are the largest the host provides. Someone tell me iam not imagining this please.
Top & Bottom Image with Tamron 17-50mm Middle image with Sigma 120-400mm HSM