M54-M54-16.5 Adapter

The ZWO M54-M54-16.5 Adapter is a precision-engineered extension tube that adds 16.5mm of back focus distance to astrophotography imaging trains. This black anodized aluminum spacer features M54 male-to-female threaded connections on both ends, making it ideal for achieving precise back focus alignment when connecting ZWO cameras to telescopes, filter wheels, and off-axis guiders. Compatible with various M54-threaded components, it provides the exact spacing needed for optimal imaging train configuration without optical elements or internal reflections.