ZWO M54 Male to M42 Female Adapter
ZWO M54 Male to M42 Female Zero Optical Length Ring Adapter
Equipped with internal M42 T/T2 female threads, this black anodized ring converts male M42x0.75 threads to male M54x0.75 threads with zero backspacing distance added to your imaging train. Simply thread this adapter over your male M42 threads, then adjoin your gear with the external M54 threads. This adapter comes standard with the ZWO 5 & 7 position 2” filter wheels and the ZWO Filter Drawer for Nikon/Canon Lenses.