Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm Helmet Camera heavy-duty binoculars

heavy-duty binoculars

Focal length: 2

Includes interchangeable M42 & M48 T-Thread adapters for versatile camera connections

ensuring flexibility for potential future upgrades

Lens Elements/Groups: 4/2

Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm Helmet Camera heavy-duty binocularsThe 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