Dark Clear Skies M54M to M42M Back Focus Spacer – 1.5mm Wide Field Imaging resulting in flatter field edges

resulting in flatter field edges and finer star points

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When used with the 61EDPH-III this flattener improves image quality in the corners of the field and reduces chromatic aberrations

makes RT29 waterproof version no harm when meeting the rainy day outdoor

Dark Clear Skies M54M to M42M Back Focus Spacer – 1.5mm Wide Field Imaging resulting in flatter field edgesThe Dark Clear Skies M54M to M42M Fine Back Focus Spacer (1. 5 mm) is a precision machined spacer designed for fine adjustment of back focus distance in astrophotography imaging trains. Purpose & Use Many telescope reducers and field flatteners require a precise back focus distance to deliver optimal star shapes and edge correction. Small spacing errors of even 12 mm can noticeably affect image quality, particularly with fast optical systems and