ZWO M54 10mm Extender Ring

The ZWO M54 10mm extender is a high-precision spacer ring, CNC-machined from durable aluminium. It adds exactly 10mm of optical spacing, ideal for fine-tuning back focus in astrophotography setups. The adapter features M54x0.75 male threads on one end and M54x0.75 female threads on the other, ensuring compatibility with many ZWO components and telescopes.

Key Specifications

• Threads: M54x0.75 (male to female)

• Extension Length: 10mm

• Material: Anodised aluminium with a matte black interior to suppress internal reflections

• Designed For: ZWO FF65, FF80, FF107, and FF130 focal reducers

Ideal Application

Use this extender when pairing ZWO’s Camera Angle Adjuster (CAA) with the FF107 or FF130 APO telescopes. It replaces the standard M54 to M48 step-down ring, allowing for a direct M54-to-M54 connection – no additional adapters needed.

Mechanical diagram