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Stellarvue F50 50mm Guidescope w/Straight-Through Helical Focuser


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Product Details

  • The F50 Guidescope w/Straight-Through Helical Focuser by Stellarvue:

    Stellarvue's F50G Guidescope has a focal length of 210 mm and sports an objective that is finished off with a broadband FMC coating for beautiful clarity and contrast. The F50 Guidescope is similar to the Stellarvue 50 mm finderscope, except it is designed to accept an M42 x .75-inch threaded T-ring or 1.25-inch nosepiece rather than a slip-fit diagonal.

    The F50G includes a 10 mm threaded extension, which allows you to convert the optical tube into a straight-through finder. Simply install the extension between the guidescope's helical focuser and the main tube and then add the 1.25-inch standard or reticle eyepiece of your choice. 

    The 1.25-inch non-rotating helical focuser is lubricated to give you a smooth focusing experience. The F50G will fit Stellarvue's standard 50 mm ring systems, creating a nice guiding system for your refractor or other telescope.

    Stellarvue F50G Guidescope Specifications:
    • Aperture: 50 mm
    • Focal Length: 210 mm
    • Focuser: 1.25-inch non-rotating Helical
    • Weight: 18 ounces
    • Diameter of Tube: 54.5 mm
    • Diameter of Dew Shield: 58 mm
    • Tube Length: 9.25-inch to 9.5-inch


    OPT Product Number: SV-F50G 


Product Reviews

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A OPT Telescopes Customer
Ron K.
United States United States
works wonderfully but took 3 months to get here

Not sure why Stellarvue has such a hard time producing products. 3months wait is a bit excessive for a budget guide scope. I've been using a POS 99.99 guide scope from Oxixn and hated it. But used it for 3 years. Having some guiding problems I reworked things and swapped over to this guide scope. STARS ARE POINTS not smears now. I got total RMS arcs of 0.17. EAT THAT!

OPT Telescopes Stellarvue F50 50mm Guidescope w/Straight-Through Helical Focuser Review
United States United States
Works like a charm

The scope has preformed as expected. No issues at all. I bought this as a guide scope for my C11 and with the idea to put it in the bracket of the original finder scope. The fit is not perfect but it’s acceptable.

Kinchen S.
United States
Great Guidescope

I had an old Stellarvue 50mm without the helical focuser and M42 threads. Moden guide cameras would not come to focus. This modelworks well and is outstanding