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

the Lunt LS40THa/B500  is built to the highest standards of quality and durability

Phantom Coating ® Group: The Phantom Group multi-layer coating introduced with the Hyperion ® eyepieces has been  further optimized  for the Morpheus ® eyepieces and adapted to the different types of glass

and general imaging use

5 @ 300-1100nm ≥OD4

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