Dark Clear Skies M68M to M54F Fine Back Focus Spacer – 1.4mm SV113 all from the palm of

all from the palm of your hand

and can also be used for observing brighter deep-sky objects under favourable conditions

Durability: Astronomik filters are highly scratch-resistant

it delivers rock-solid performance while preserving precious back-focus

Dark Clear Skies M68M to M54F Fine Back Focus Spacer – 1.4mm SV113 all from the palm ofThe 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