[davidmanze]

I have typed it a few times before: the idea that the flange distance needs to be exact for AF to be on point is just plain wrong. So shims or no shims, it does not matter. What does matter? The lens making the final step less precise than the camera and user would want.

Or: some colour focussing at a different plane than others, a colour that the camera's AF sensor is sensitive to. This makes the camera see things in focus, when the user does not in the final image.

Dave, I feel reluctant to ask you a question since you rarely answer on point when I do. But I will make myself ask it anyway: Do you perhaps use different light sources for the close up situations and the further away situations?

     Please BC ask away!

                     I live in a boat with lots of windows..........nearly always sunny and most is shooting outside.  My simple starting test was on the D750 with the boats opposite which produced a super sharp image wide open...great!.......then a quick shot of a post ......and oh dear....straight to +10 and still Oh dear....+20 and errrr  derr!........lots of various shots at distance, close to...everywhere it's front focused, but fine on the D500 at +5.

 

   Anyway that game is on hold.....two more games since.

 

 The initial AF 80-200mm F2.8 push pull at 160 euros didn't materialise not a word further from the seller.......then out of the blue....another appears at the same price......with no fungus! 

  Please feel free to comment on any of my nonsense BC