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Scott

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Posted on Tuesday, November 16, 2004 - 01:45 am:   

Re: being unable to get a focused image at the film plane within the normal range of focus adjustment:

Here's a mistake I have made a couple of times. After removing all three lens elements of a 1950s lens for cleaning, I accidently install the middle element backwards. You can get an image on the film plane, but it will never be sharp.

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