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Old Apr 13, 2009, 2:52 PM   #1
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I have recently purchased a Minolta beercan 70 210 f4 and a Sigma 70 210 apo, 3.5 4.5. I tested both by attaching to my A700 on a tripod with the self timer release. Neither lens produces tack sharp pictures. I focused on a real estate sign. I had the lenses fully extended. I was wondering if the sign was just too far for the lens. What is a reasonable distance for these lenses?
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Old Apr 13, 2009, 3:42 PM   #2
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First, check to see if you have a frontfocus/backfocus problem. It's unlikely that two different lenses would have the same problem.

See http://www.focustestchart.com/
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