Altair TMS 120mm Guidescope Rings

The Altair TMS Ultra Light Guide Scope Rings are available in 120mm or 150mm sizes. They have a lightweight design unique to Altair Astro, which results in a far lighter guide scope ring, while still maintaining strength and rigidity.

The Altair TMS uses durable all stainless steel M8 threads - that means they will not corrode, unlike cheaper makes which use low grade blackened steel threads and screws, which eventually go brown with rust. The Altair Telescope Mounting System (TM) is more durable than any other product on the market we've seen.
This new Clear Silver colour goes well with any telescope, is arguably easier on the eye than black, and goes very nicely with our blue hardware range. Sure, telescopes are meant to be used in the dark - but there's no harm in your setup looking attractive too! A full Altair Telescope Mounting System is a thing to behold!

Check out this customer review of the earlier non-lightweight Altair TMS Guide Scope Rings (opens new window).


Direct bar or plate mounting: The Altair Guide Scope Rings are unique (at least at the time we write this) because they can be mounted on the top or bottom of Altair Losmandy-format or Vixen-format bars via two M6 bolts on each ring, to stop them twisting like other makes with single bolts. All Altair TMS Losmandy plates or Vixen bars have this two-hole pattern, and you can adjust the separation of the rings by choosing different holes along the length of the plate. GSR rings have flattened edges for good contact with the bar or plate they're fastened to and are far more rigid than any other guidescope rings we have seen to date.
Direct clamp mounting: GSR rings can also be mounted on Altair TMS Small Vixen Clamps or Losmandy Saddle Plates to slide back and forth to achieve the best balance. This is perfect for Altair Astro RCs and Meade and Celestron SCT telescopes with an inverted rail on top. (see picture below)

The GSR benefits from easy-grip hard anodised knobs, custom-machined for a positive grip (we tested several iterations). They are very easy to un-tighten and adjust, even with gloves on.

Each thread has a plastic end cap to give a more forgiving contact with your optical tube without causing movement. This is better than soft rubber end caps, which change compression with temperature and cause movement, often splitting after a year or so of use.

Altair TMS is made in the UK at our local machine shop on HAAS CNC milling machines, which means we have complete control over quality. Each part is hand polished before anodising to remove burs and give a smooth finish. The quality level and material means a slightly higher price than budget rings. Recommended for those who want the best.