M90 to M90 Extension Tube 25mm | Dark Clear Skies IR Astronomy Camera ACS (Active Cooling System) is

ACS (Active Cooling System) is a external air-cooled system

Off-axis guider (OAG) systems

two-group optical layout is engineered to flatten the naturally curved field of refractor telescopes while maintaining good colour correction and edge performance

Imaging Benefits:

and general imaging use

M90 to M90 Extension Tube 25mm | Dark Clear Skies IR Astronomy Camera ACS (Active Cooling System) isM90 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