ZWO M48/M54 (F/M) 2mm adapter for backfocus adjustment

This adapter allows you to switch from a male M48 thread to a male M54 thread by modifying only 2mm the backfocus of your mount.

Construction in aluminum with black anodizing.

Use, for example, to connect a ZWO filter wheel and a ZWO M54 filter holder or an optical divider.

Example: Connection between a ZWO OAG splitter and a 50.8mm EFW filter wheel