Askar M54 18mm +/- 2mm Backfocus Adjuster
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Askar M54 Backfocus Adjuster features front (female) and rear (male) M54x0.75 threads. The base thickness is 18 mm, with ±2 mm adjustment range in increments of .05mm. it has a printed scale for easy reference. It has click-stop adjustment, so you feel a small click as you turn it. In excellent condition.
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