On most SLRs the bar or button on which the return mirror rests in the down
position appears to be either made of a synthetic material, or coated in
one. I've theorized that over time changes in the dimension of the material
could affect focusing calibration.
But, if I'm recalling correctly, John H. dispelled these notions not long
ago. Apparently focusing screen installation and seating are a more
important factor. Correct me if I'm disremembering.
-----------
Lex Jenkins
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Hoist my petard! Yoikes and away!! - Ur Amblet, 'The Very Bad Quarto'
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