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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
Focal length: 2
UHF in the high frequency band has better penetration and is more suitable
Includes interchangeable M42 & M48 T-Thread adapters for versatile camera connections
Lens Elements/Groups: 4/2
Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm Helmet Camera Focal length: 2The 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
