M117 to M117 Extension Tube 25mm | Dark Clear Skies Mounting Plate Thanks to the thoughtful design

Thanks to the thoughtful design of the ESATTO focuser and ARCO rotator

overall smooth lines

higher contrast

Switch seamlessly between solar and night-sky observation

SC4 has a function called Sensor Analysis

M117 to M117 Extension Tube 25mm | Dark Clear Skies Mounting Plate Thanks to the thoughtful designM117 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