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Its Etalon system
such as :X -A5 X -A20 X -A10 X -A3 X -A2 X -A1 X -T2 X -E3 X -E2S X -E2 X -E1
This design can reduce light leakage and provide clearer vision
Easy installation and smooth operation
Dark Clear Skies M68M to M54F Fine Back Focus Spacer – 1.4mm Telescope Mount Handle Its Etalon systemThe Dark Clear Skies M68M to M54F Fine Back Focus Spacer (1. 4 mm) is a precision machined spacer designed for fine adjustment of back focus distance in astrophotography imaging trains. Purpose & Use Many modern reducers and field flatteners require extremely precise back focus spacing to deliver optimal star shapes and edge correction, particularly when used with larger sensors. Even small spacing errors of around 1 mm can noticeably affect image
