M54 Adapter for 20mm Backfocus with OAG-L

The ZWO M54 Adapter for 20mm Backfocus with OAG-L is a specialized optical adapter designed for integrating ZWO's OAG-L (Large Off-Axis Guider) with ASI cooled cameras. This adapter provides 15mm of optical path length and achieves the full 20mm backfocus specification when combined with an optional 5mm sensor tilt adapter, making it ideal for astrophotographers who want to use an off-axis guider without a filter wheel. The adapter accommodates standard 2" filters and maintains the critical 55mm back focus distance necessary for proper imaging train configuration with modern telescope systems.