Step-down ring 109 to 78mm

With this adaptors you can connect Newtonian telescopes with 109mm ring clamp and focusers with 78mm ring clamp.

This adaptors fits Newtonian telescopes from Omegon and GSO with 3" focusers.

The adaptors consists of two parts:

Part A fits into a 109mm flange, such as the one on the base plate of the focuser at Omegon Telescope Pro Astrograph 304/1200 OTA. On the other side is a female M85 thread.

Part B has an M85 male thread and a 78mm flange. For the latter, 4 grub screws are included.

Assembly then goes like this:

1. Screw parts A and B apart
2. Insert part A into the telescope base plate and screw it to the base plate
3. Screw the focuser to part B via the 78mm flange
4. Screw focuser (with part B) to part A (in base plate) via M85 thread