CELESTRON M42 SPACER RING KIT

The Celestron M42 (T2) spacer ring kit is a collection of extension tubes featuring male M42 x 0.75 threads on one side and female M42 x 0.75 threads on the other. They can be useful for reaching the precise backfocus distance as required by certain telescopes or corrective optics.

Included are 3 rings of different sizes - 7.5mm, 12mm and 30mm. Each ring has a knurled grip on the outer surface. The interior surfaces are blackened and feature baffles to reduce internal reflections.