ZWO 30mm f/4 Mini Guide Scope with 120mm focal length, compatible with all ZWO guide cameras and comes with a narrow, finderscope-style dovetail bar that is compatible with the Skywatcher finderscope shoe, Baader Standard Base
All new unique, RotoLock high-quality fully multi coated WO 50mm f/4 Guiding scope that fits perfectly on your William Optics OTA and other telescopes. The tube diameter is 54mm and dew shiled of 58mm.
The Antares Versascope is a very versatile accessory. This is a 10 x 60 crosshair finderscope that doubles up as a small guide scope. A very inexpensive way to either upgrade your current finder or get a guidescope attached easily onto your system.
Sky-Watcher's EVOGUIDE-50ED is the ultimate new high quality 50 mm doublet ED Guidescope, utilising Ohara S-FPL53 glass for the ED element. With a focal length of 242 mm it has a very fast focal ratio of f/4.8. The telescope is equipped with a fine and precise helical focuser.
Rother Valley Optics have put together a simple, but effective low cost guide package. This small lightweight system, includes a Skywatcher 50mm finderscope, a finderscope adaptor to C thread on the back, then an Altair Astro monochrome guide camera.