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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13
Excellent central wavelength stability with minimal temperature-induced shift
Scope of Delivery: Bresser Junior 60/700 Refractor Telescope
offering outstanding value for most users
making it a versatile and powerful addition to any solar system
Dark Clear Skies M54M to M42M Back Focus Spacer – 1.5mm lunar observation Excellent central wavelength stability withThe 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
