A compact and convenient auto-guiding solution based on the QHY Mini Guidescope and ZWO ASI-120MM camera.
Mounts quickly and easily to Synta-type finders (Skywatcher, Celestron, Orion, etc).
Also has a 1/4" photo-thread underneath so can be fitted to, say, a mini ball-&-socket tripod head.
The 30mm doublet objective and 130mm focal length results in a fast f4.3 focal-ratio.
A simple helical front focusing system provides fine focus adjustments and the focuser can be locked to maintain focus position.
The metal thumbscrews are nylon tipped so that they won't damage the finish on the lens barrel.