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Vixen SD81S II f/7.72 Doublet Refracting OTA Telescope

SKU : VX-26146

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Astroimaging Options:

  • Prime Focus
  • Eyepiece Projection
  • Afocal Photography


Product Details

  • The SD81S II OTA is an Apochromatic Refractor Telescope

    It features high-performance Super ED Glass(SD) made of leading-edge FPL53 glass to deliver extremely clear and sharp images by eliminating color aberration. This SD glass is designed to gather all g-ray (purple), C-ray (red), F-ray (blue), d-ray (yellow), and e- ray (green) to about a "0" value, making excellent lens material which reduces chromatic aberration over all colors.

    The light baffle positions in the drawtube are arranged to take advantage of the entire field of view of a DSLR camera with a full frame image sensor. When used in combination with the new optional SD Reducer HD Kit or SD Flattener HD Kit, you will have a 44 mm image circle with full-format DSLR cameras.

    Vixen SD81S II Refractor Telescope OTA-long

    The Reducer DH, sold separately, includes the SD Flattener DH and is essential for wide field astrophotography with the SD Scopes.

    Eyepieces are also sold separately.


    Additional Information:

    • Coating :Multi Coating
    • Finder Scope: Red Dot Finder
    • Adapter Thread: 60 mm/ 42 mm for T-Ring
    • Visual Back : 50.8 mm and 31.7 mm Push fit with the supplied flip mirror diagonal


  • specifications

    Aperture81 mm (3.25")
    Camera/Eyepiece Connection2" Nosepiece
    Dawes Limit1.43 arcseconds
    Focal Length625 mm
    Focal Ratiof/7.72
    Highest Magnification162x
    Light Gathering Power134x
    Limiting Magnitude13.3
    Optical DesignDoublet Refractor
    Tube Diameter90mm
    Tube Length585mm
    Tube Weight7.2 lbs
  • included items


    Accessories Included:

    • Tube Rings
    • Flip Mirror Diagonal
    • Dovetail Plate
    • Red Dot Finder
    • Carry Handle



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