Metal lock ring (retaining ring, jam nut) with 1-3/16" x 40 TPI thread for mounting Wollensak lenses and #1 Rapax, Alphax & Betax shutters to unthreaded enlarger or camera lens boards. A threaded flange is also available and is listed seperately. Please inqire if you have compatibility questions.
Note: This ring is not compatible with all Wollensak lenses, another standard Wollensak thread is 1-19/32" x 30 TPI, please see the alternate listings.
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