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.
A nice small, compact and lightweight guidescope kit put together by RVO. The Skywatcher 9x50 straight finderscope makes the ideal small guidescope due to it's 50mm aperture and fully adjustable bracket.
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.