Female M54 to Female M42 Thread Reduction Ring. This zero optical length adapter allows you to connect M42 thread telescopes while maintaining the optical length of your entire astrophotography setup, compatible with the camera's back-focus.

Key Features

• zero optical length that does not affect the camera's back focus
• perfect for connecting telescopes with M42 thread to adapter rings and off-axis guiders with M54 thread

Technical parameters

• optical length: 0 mm
• male thread: M54 x 0.75
• female thread: M42 x 0.75

Set components

• reduction ring M54-M42

Guarantee

24 months