Coincidence focusing system. Positive measurements to .02 mm accuracy, 15x wide-angle piece.
Measuring range: Radius of curvature. 94-6.4 mm (in 0,05 mm steps ) Diopter 36-52 (in 0.25 steps) Diopter 36 520in 0.25 steps) Contents: 2 spare Bulb, Duster Cover
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