M90 to M90 Extension Tube 25mm | Dark Clear Skies DSLR Alternatives The ASKAR FMA180 objective lens

The ASKAR FMA180 objective lens features a triplet air-spaced APO design

Connection cable

up to 40 receivers

and star fields

Secure communications are an essential requirement

M90 to M90 Extension Tube 25mm | Dark Clear Skies DSLR Alternatives The ASKAR FMA180 objective lensM90 to M90 Extension Tube 25mm The Dark Clear Skies M90 to M90 25mm Extension Tube is a precision machined spacer designed for fine back focus adjustment in astrophotography imaging trains that use large diameter M90 threading. Featuring M901 male threads on both ends, this extension tube is ideal for making smaller spacing corrections when pairing reducers, flatteners, filter systems, and cameras that require accurate optical spacing. The 25mm