Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm wide field telescope With a range of up

With a range of up to 1640 ft in open areas and multiple notification modes

perfect for securely attaching the ZWO Seestar

Just simple

Precisely corrects field curvature

Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm wide field telescope With a range of upThe Dark Clear Skies M54M to M42M Fine Back Focus Spacer (2 mm) is a precision machined spacer designed for accurate fine adjustment of back focus distance in astrophotography imaging trains. Purpose & Use Many telescope reducers and field flatteners require very precise back focus spacing to deliver optimal star shapes and edge correction. Small spacing errors of just a few millimetres can noticeably affect image quality, particularly when using fast