Similar to a finder scope, these guide scopes feature a 1.25" non-rotating helical focuser. The focuser is a standard 1.25" compression ring unit with an external M42 X .75 t-thread. So one can either use the camera's t-thread or a 1.25" nose piece. These guide scopes have been very popular for guiding a refractor. The 50 mm guide scope fits on either our 50-60 mm finder scope rings or our 50-60 mm guide scope dual ring systems. These guide scopes now come with both a 10 mm and 15 mm threaded extension. Using these threaded extensions, this guide scope may be converted into a straight-through finder scope or used with a very wide variety of guide cameras! Just install the extension between the focuser and main finder scope tube as shown below and add our optional 1.25” reticle eyepiece. But please note, this guide scope is not designed to work with a diagonal.
Physical Dimensions and Specs
The Stellarvue guide scope weighs 18 ounces and works with all of our standard 50 mm ring systems. This guide scope employs the same high-quality 210 mm focal length, broadband fully multi-coated objective lens as in our top-rated F50 finder scopes. Other fittings are black anodized. The main tube is interior painted in ultra-flat black. The focuser is lubricated for improved stability and smoothness. The tube is 54.5 mm in diameter, dew shield is about 58 mm in diameter. The length is 9 1/4” - 9 3/4”.
Important: When installing mounting rings DO NOT unscrew the dew shield. The objective may fall out. Always unscrew the rear assembly (adapter, prism, focuser, eyepiece) from the main tube to install the rings. *Rear thread size for all F050 models is M52 x 1mm