Last evening, I put my 70-200 VR lens on my D800 and filled a card. When I looked at them on the computer, they didn't seems as sharp as they could be or should be. I took the same combination out in the front yard today to shoot a few test shots. Before taking any shots, I looked at the AF Fine Tune settings. It said it was using +20, but right under it, the Default setting is set to +10.
I thought the camera would recognize a lens and apply the saved Default value? I had the lens off the camera when I did the new firmware upgrade today, so it should have set the AF to +10 when I put it on if that is the default. Right?
Seems like it would revert to a default value first, then temporarily use the current value as the saved value if I changed it—as long as the lens stays on the body.
If you have saved an AF fine tune value for a particular lens type, then that value will be used whenever that lens is mounted.
The default value is only used for CPU lenses that have not had a value saved for them.
You have the priority reversed in your scenario.
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I have 10 lenses entered in the AF fine tune data base. When I add fine tuning to a lens I only change the saved value. The default value stays at 0. A new lens always starts out as a 0 if you don't fine tune the lens.
I am not sure when or why I ever had +20 entered in the saved value of the 70-200 VR2 lens. The correct one was closer to +10. In the latest tests, I've been moving it to +8. My 200-400 was at Nikon Service for repairs and I had to use this lens with a 1.4 TC for a while. It needed more + fine tune with the TC attached.
I am guessing I just transposed the concept of the saved value and default value, leaving the menu thinking I was at +10 originally.
I shot with it again yesterday and things look sharp. I will be changing the default setting back to zero for a while, too.
The default setting is for a camera that has front or back focus issues not for using with lenses that need adjustment. Of course, you could use the default if you only had one lens in your arsenal and it needed adjustment.