National Bureau of Standards, A TEST of LENS RESOLUTION for the PHOTOGRAPHER $8 including shipping to USA address for PayPal add $.60

Consists of one calibrated test target and a reprint of a 16 page 6x9 inch booklet that describes a test that will tell you how to calculate resolution in line pairs per millimeter based on a simple practical photographic test. The target is the original made by NBS. I have a few of these.

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