Vixen SD81S II OTA ES26083‑SO — 81 mm Super‑ED Apochromatic Refractor Optical Tube Assembly

Vixen

Price: $1,382.99 USD
List Price:
Price: $1,382.99 USD
Shipping calculated at checkout.

The Vixen SD81S II OTA ES26083-SO is a premium 81 mm Super‑ED apochromatic refractor optical tube designed for both visual astronomy and astrophotography. With a fast 625 mm focal length (f/7.7) and high-quality SD glass, it delivers wide, sharp, and high-contrast views — perfect for lunar and planetary observation, star clusters, nebulae, and deep-sky objects.

This compact and portable OTA balances portability and optical performance. Its refractor-style light path produces crisp, true-color images without central obstruction, while fully multicoated optics maximize light transmission and contrast. The SD81S II supports 2″ and 1.25″ eyepieces, and its drawtube accepts standard T-ring/camera-mount threads for prime-focus or afocal astrophotography when combined with suitable accessories.

Features & Benefits

  • High-quality Super‑ED optics — 81 mm apochromatic objective delivers sharp, color-accurate, high-contrast images with minimal chromatic aberration.

  • Fast focal ratio (f/7.7) — 625 mm focal length provides a wide field of view suitable for deep-sky objects as well as the Moon and planets.

  • Compact and portable build — 585 mm length and 90 mm diameter makes the OTA easy to mount and transport.

  • Flexible eyepiece and imaging compatibility — Accepts 2″ and 1.25″ eyepieces; drawtube threads support T-ring/camera mounts for astrophotography.

  • Rich included accessories — Flip-mirror diagonal, dovetail plate, tube rings, carry handle, and red-dot finder for easy setup.

Specifications

Spec Detail
Optical Design Apochromatic refractor (Super‑ED / SD glass)
Aperture (Objective Lens) 81 mm
Focal Length / F‑Ratio 625 mm / f/7.7
Resolving Power / Limiting Magnitude 1.43 arc‑sec / 11.3 mag
Light Gathering Power ~134× naked eye
Optical Tube Dimensions 90 mm diameter × 585 mm length
Optical Tube Weight 3.6 kg (net 2.3 kg)
Focuser Rack-and-pinion focuser with lock knob
Eyepiece Mount Accepts 2″ eyepieces; 1.25″ adapter supported
Imaging / Photography Compatibility Prime-focus, eyepiece projection, afocal imaging via T-ring or adapter
Accessories Included Flip-mirror diagonal, dovetail plate, tube rings, carry handle, red-dot finder

Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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