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Bernd Ebach

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Posted on Thursday, March 03, 2005 - 06:26 am:   
Here's the question:

If I want to take a tack sharp image of the wall in front of me and I put my lens to its near focusing end and the marking on my lens says say 0.9 m, to which bench mark on the camera do I have to measure the distance (asuming the lens is perfectly aligned)? The film plane, the lens front element or somehwhere in-between?

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