Tele Vue Ethos-SX 3.7mm Ultra Wide-Angle Eyepiece (1.25"/2")

BH #TEEP3.7E • MFR #ETH-03.7
Tele Vue
Tele Vue Ethos-SX 3.7mm Ultra Wide-Angle Eyepiece (1.25"/2")
Key Features
  • 3.7mm Focal Length
  • Wide 110° Field of View
  • 1.25 and 2" Diameter Barrel
  • Fully Multi-Coated Optics
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Engineered to recapture the identical field of view astronauts enjoyed through the windows of their LEMs during the moon landings, Tele Vue's Ethos-SX 3.7mm Ultra Wide-Angle Eyepiece delivers an expansive 110° angle of view and offers a long eye relief, despite the short focal length, with high contrast and excellent on-axis sharpness; and virtually zero astigmatism or field curvature. Combining a hyper-wide apparent angle of view with its short focal length, this Ethos delivers high magnification with enhanced details when looking at the moon and planets, while still offering an immersive observational experience.
In Stock
On Display in Store
$628.00
$53/mo. suggested payments.*
with 12 Mos. Promo Financing
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Tele Vue Ethos Overview

Engineered to recapture the identical field of view astronauts enjoyed through the windows of their LEMs during the moon landings, Tele Vue's Ethos-SX 3.7mm Ultra Wide-Angle Eyepiece delivers an expansive 110° angle of view and offers a long eye relief, despite the short focal length, with high contrast and excellent on-axis sharpness; and virtually zero astigmatism or field curvature. Combining a hyper-wide apparent angle of view with its short focal length, this Ethos delivers high magnification with enhanced details when looking at the moon and planets, while still offering an immersive observational experience.

A unique design characteristic of the Ethos allows it to be used in the smaller, more common-sized 1.25" drawtubes and accessories; and a simple screw-on installation of the included adapter converts it for use in larger 2" versions. This provides users with an easy and convenient way to expand its functionality and versatility, without limiting its use or relying on eyepiece holder reducer adapters. This model is parfocal with a variety of Tele Vue eyepieces, requiring little or no refocusing when changing between them — greatly decreasing vibration and increasing convenience. A textured collar around the housing provides sure handling in cold weather or while wearing gloves, and a fold-down rubber eyecup allows for comfortable use with or without eyeglasses.

1.25" Parfocal Eyepieces

Parfocality is only achieved when in the 1.25" mode
  • Plössls
  • Radians
  • Type-6 Naglers
  • Nagler Zooms
  • 1.25" Panoptics

2" Parfocal Eyepieces

Parfocality is only achieved when in the 2" mode
  • 10mm and 13mm Ethos

Tele Vue Ethos Specs

Focal Length3.7mm
Barrel Diameter1.25" and 2.0"
Eye Relief15.0 mm
Field Stop Diameter7.04 mm
Apparent Field of View110°
Dimensions6.1 x 2.2 / 15.5 x 5.6 cm
Weight17.6 oz / 499.0 g
Packaging Info
Package Weight2 lb
Box Dimensions (LxWxH)8.3 x 4.4 x 4.4"
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