M117 to M117 Extension Tube 25mm | Dark Clear Skies

M117 to M117 Extension Tube 25mm | Dark Clear SkiesM117 to M117 Extension Tube 25mm The Dark Clear Skies M117 to M117 25mm Extension Tube is a precision machined spacer designed for fine back focus adjustment in large format astrophotography imaging systems. Featuring M1171 male threads on both ends, this extension tube is ideal for making smaller spacing corrections when pairing large reducers, flatteners, filter systems, and cameras. The 25mm optical length allows accurate tuning of optical spacing

Use M4/M5 screws to mount the AAF body onto the flexible coupler

and close-up optical work

this adapter is ideal for imaging trains where back focus is critical

75 male thread (standard 2" filter thread)

25″ CLS (City Light Suppression) Filter is designed to reduce the effects of artificial light pollution while maintaining good transmission of natural starlight and broadband astronomical targets

TT117 Transmitter

QE is still over 60%

Guiding & basic Deep Sky imaging/viewing capabilities – all in one package

High-Performance Optical Design

Can I use this filter with a smaller telescope

and deep-sky objects like nebulae and galaxies

● SKU: RTSCC