M68 SPACER SET 0.15 - 1mm T ring they aren’t extremely accurate anyway

they aren’t extremely accurate anyway

so cannot be used with any other telescope model

5x extender focal ratio F/14

The SPIDER 230C is designed specifically to be used with standard equatorial mounts for optical telescopes

25" & 11" Schmidt-Cassegrain telescopes offers an easy and effective solution to safely transport your telescope OTA

M68 SPACER SET 0.15 - 1mm T ring they aren’t extremely accurate anywayThe M68 spacer ring set is useful for fine tuning the precise backfocus distance as required by correctors, as well as preventing binding between two M68 threaded parts. This set comes with nine rings of various thicknesses between 0. 15 and 1mm. Specifications Optical length 0. 15, 0. 2, 0. 3, 0. 4, 0. 5, 0. 6, 0. 7, 0. 8, 1 mm Weight 10 g SKU AX M68SHIM0. 15 1. 0