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Blackened Lens Edges
Lens Elements/Groups: 4/2
Focal length: 2
ensuring flexibility for potential future upgrades
UHF in the high frequency band has better penetration and is more suitable
Dark Clear Skies M54M to M42M Back Focus Spacer – 2mm Helmet Camera Blackened Lens EdgesThe 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
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