Forum: Pentax SLR Lens Discussion
08-29-2013, 11:57 AM
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Forum: Pentax SLR Lens Discussion
07-12-2013, 01:05 PM
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I've heard a way to test lens is to take a picture of a grid to look for distortion.
Is there any products that worked well? Is it possible to print your own for the test?
Any recommendations?
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