Dark Clear Skies M68M to M63F Fine Back Focus Spacer – 1.4mm Poseidon-M Pro AR Coating: Dielectrically coated

AR Coating: Dielectrically coated

ensuring comfortable and precise observations

Once installed

and 82A colour filter)

and explore detailed information about the cosmos

Dark Clear Skies M68M to M63F Fine Back Focus Spacer – 1.4mm Poseidon-M Pro AR Coating: Dielectrically coatedThe Dark Clear Skies M68M to M63F Fine Back Focus Spacer (1. 4 mm) is a precision machined spacer designed for fine adjustment of back focus distance in large format astrophotography imaging trains. Purpose & Use Many modern reducers, flatteners, and imaging systems that use larger thread standards such as M68 and M63 require extremely precise back focus spacing to deliver optimal star shapes across the image field. Even small spacing errors of around