Dark Clear Skies M68M to M63F Fine Back Focus Spacer – 1.4mm Poseidon-M Pro Its wide apparent field helps

Its wide apparent field helps keep objects comfortably framed

it ensures reliable connectivity

AR Coating: Dielectrically coated

ensuring comfortable and precise observations

Mobile terminal support ONSTEP

Dark Clear Skies M68M to M63F Fine Back Focus Spacer – 1.4mm Poseidon-M Pro Its wide apparent field helpsThe 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