>>>I received some incredible expert evidence which details how random
>>>production variations almost guarantee that only 30% of all cameras
>>>can be accurately focused.
>>>If one accepts this premise (and I do), does anyone know of any camera
>>>models where such errors can be ***EASILY*** adjusted out or
>>>normalized? [rest deleted]

>>Hmmm... I have checked many a Nikon body for focus accuracy, and I do
>>occasionally find one that is slightly out (not enough for most people
>>to notice, but I am a nut about such things) - maybe one in 15-20 or
>>so. I added VERY slight spacing dabs to the viewing screen of a mint
>>FA I wanted to keep (and use with that one screen....) where the screen
>>contacts four plane-locating points in the finder. The Nikon F, F2, F3,
>>and probably F4 are relatively easy to adjust in both focus (using
>>shims) and framing, though I have never seen one that had incorrect
>>focus, just slightly decentered framing. At least with Nikon, I would
>>not worry (though I would [and do] check focus accuracy).
>>Hope This Helps

>Hmmm...are any of these shims of conventional manufactured origin, or
>are they shape to fit?
>Best,
>Art
>doylefam@onramp.net

Hi-- I have never taken the moveable frame that sits under and locates the
focus plane and framing in the Nikon F series cameras out to check (since
the focus of all F's I have checked has been correct), but it feels like
there may be some thin flat brass shims (like the ones used in the rear
of Nikkor superwides under the bayonette mount to adjust infinity focus)
under the frame. If one needed to add spacing, that would be easy. If one
needed to take it away, and if there were no shims, one could reduce the thickness of the frame a bit, then add back thickness with shims (though
I have found no need to do this, so far. If the shims exist, they would be custom rectangles, but four small pieces fit under the four screws would work
as well. David Ruether