Guide scope rings or guide rings are mechanisms used for mounting guide scopes. A guide scope is a telescope used to monitor tracking accuracy while a main telescope takes a long-exposure photo. Errors in tracking are detected with a guide scope by monitoring a guide star. Corrections are made by the mount to keep the guide star centered, and thus, keeping the main imaging telescope pointed at a target for the whole duration of an exposure.
There may be instances when it is difficult to find a nearby guide star. With guide scope rings, a guide scope may be pointed, to some extent, at a part of the sky that is different from what is being photographed, allowing access to more guide stars. This DIY guide scope rings set is used with a 70 mm f/5.7 guide scope and a 100 mm f/9 imaging telescope.
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Night Sky in Focus | Astronomy and Amateur Radio © Anthony Urbano | Manila, Philippines