The 7A9 is useful with film television and still optical systems. At 10 x 10 it's a convenient addition to your equipment kit. Use it alone to check sharpness and back focus of any optical system or use it to check critical focus on a set. The 7A9 chart has resolution targets from 1 to 9 10 to 97 lines per millimeter when set up at a standard distance of 60x the focal length of the lens being tested.
The chart ships mounted on fiber board and with full detailed instructions.
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