Ok, I'm on to something. I think my center AF point needs help. Check out the photo when I select the center AF point. I am on my elbows on the floor holding my breath when I depress the shutter button gently. BTW, I have focus problems with other lenses so I'm starting to think it's my camera and not the lenses.
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Now check out the photo when I use the bottom AF point. Same position, same everything.


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. Sigma 500 DG Super
, Kenko tubes 
