ASToptics CNC Guide Scope Rings 90 mm This pair of 90 mm CNC guide-scope rings provides adjustable support for a guide telescope with an outside tube diameter of 45–80 mm. Six adjustment points across the pair allow the guide telescope to be aligned relative to the main optical tube.
Manufacturer model: ASToptics CNC Guide Scope Rings 90 mm · Specifications checked against manufacturer data on 2026-11-03
This pair of 90 mm CNC guide-scope rings provides adjustable support for a guide telescope with an outside tube diameter of 45–80 mm. Six adjustment points across the pair allow the guide telescope to be aligned relative to the main optical tube.
The rings are made from aluminium. The manufacturer lists 270 g for the pair, expressed as two 135 g rings. The quoted guide-tube range describes the usable external tube diameter, rather than the telescope’s clear aperture.
ASToptics manufacturer documentation
Published weight is for the pair. Select using guide-tube outside diameter, not objective aperture.
| Alignment | Six-point adjustment across the ring pair |
|---|---|
| Pair weight (g) | 270 |
| Individual ring weight (g) | 135 |
Data sheet
ASToptics CNC Guide Scope Rings 90 mm This pair of 90 mm CNC guide-scope rings provides adjustable support for a guide telescope with an outside tube diameter of 45–80 mm. Six adjustment points across the pair allow the guide telescope to be aligned relative to the main optical tube.
Manufacturer model: ASToptics CNC Guide Scope Rings 90 mm · Specifications checked against manufacturer data on 2026-11-03
