Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)

Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)

Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)

B&H # VIED81SRT MFR # 26082
Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)

Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)

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Product Highlights

  • 81mm Apochromatic Refractor
  • 625mm Focal Length, f/8 Focal Ratio
  • Anti-Reflection Fully Multi-Coated Glass
  • Super-Low Dispersion (SD) Glass Lens
  • 1.25" Rack-and-Pinion Focuser
  • 90° Flip-Mirror Diagonal
  • Red-Dot Finderscope
  • Mounting Ring Set with Carry Handle
  • Vixen-Style Mount and Tripod Required
  • Made in Japan
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This product may contain mercury. Consult your local environment authorities for regulations regarding how to properly dispose of products containing mercury.

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  • 1Description

Vixen Optics' ED81S 81mm f/8 Apochromatic Refractor Telescope is an ideal optic for both celestial observation and astrophotography. Optically, it is designed with a fully multi-coated, apochromatic super-low dispersion (SD) lens system that corrects both spherical and chromatic aberrations. This correction creates a wide flat field of view without distortion and removes the blue-tinted "halo" effect and off-axis coma for true high-contrast color transmission. The optical tube assembly (OTA) is made and assembled in Japan to the high standards expected from such production.

The scope can be used for multiple astrophotography techniques including prime-focus, afocal imaging, or eyepiece projection. A traditional rack-and-pinion focuser, with adapter rings, is employed to be able to handle the heavier loads of astrophotography rigs and can accept 1.25" eyepieces and accessories for making visual observations. Vixen includes a flip-mirror diagonal that allows the use of two different eyepieces for observational flexibility, or an eyepiece and imaging system that lets users simply flip the mirror to check alignment and tracking accuracy between exposures without having to touch the imager. While the OTA is offered here without a mount or tripod, a Vixen-style dovetail plate that fits on compatible saddles is included, along with a mounting ring assembly with an integrated carrying handle to make setup and breakdown easier.

Optical Performance
  • 81mm aperture
  • f/8 focal ratio
  • 625mm focal length
  • Refractor optical system
  • Anti-reflection multi-coated optics improve light transmission for brighter, high-contrast images
  • Apochromatic lens configuration corrects for spherical and chromatic aberration to produce distortion-free images with accurate color representation
  • Super-low dispersion (SD) glass elements correct for chromatic aberration to increase true color fidelity and improve contrast
  • Resolution: 1.43 arcsec
  • Sturdy rack-and-pinion with 50.8mm and 60mm mounting thread for imaging accessories and 1.25" eyepiece holder
  • Red-dot finder with bracket
  • Dual 1.25" eyepiece holders
  • Internal flip mirror allows the use of two eyepieces, or eyepiece/imaging combination
  • Able to perform various astrophotography techniques including eyepiece projection, prime-focus, and afocal imaging
  • When imaging, quickly flip mirror to check tracking between exposures without un-mounting imaging rig
  • Back focus from rear edge of focuser body: 149.0mm
  • Back focus with reducer from rear edge of reducer: 63.5m
  • 60mm and 50.8mm T-threads on straight-through light path allow the use of optional camera-specific T-rings
  • OTA only, requires mount and tripod for proper use
  • Includes a set of two mounting rings
  • Integrated Vixen-style dovetail plate
  • Integrated carrying handle makes setup and breakdown more safe and secure
  • Weight: 5.1 pounds
In the Box
Vixen Optics ED81S 81mm f/8 Apochromatic Refractor Telescope (OTA Only)
  • Red-Dot Finderscope
  • Flip-Mirror Diagonal
  • Dovetail Mounting Plate
  • Carrying Handle
  • 2 x Tube Rings
  • Limited 5-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Refractor
    Aperture 81mm
    Focal Length 625mm
    Focal Ratio f/7.7
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° flip
    Finderscope Red dot
    Tripod None
    Mount Type Vixen-style dovetail plate
    Power Source N/A
    Optical Tube Dimensions Length : 23.0" / 58.5 cm
    Tube diameter: 3.5" / 9.0 cm
    Dew-shield diameter: 100 mm
    Weight 5.1 lb / 2.3 kg
    Packaging Info
    Package Weight 9.6 lb
    Box Dimensions (LxWxH) 24.8 x 10.7 x 7.8"
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