Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm wide field telescope while the extended drawer handle

while the extended drawer handle makes pulling the filter slider smooth and effortless

Simply attach this adapter to your camera the same way as you attach a lens then screw your T2 lens or accessory into the adapter

Calcium K-Line and Calcium H-Line in one dualband filter

Black anodized finish

which provides excellent colour correction and reduces chromatic aberration

Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm wide field telescope while the extended drawer handleThe 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