The 3.7 mm Ethos-SX Eyepiece (the Simulator eXperience) is part of the Tele Vue Ethos Eyepiece Series.
The Tele Vue 3.7mm Ethos-SX eyepiece is designed and crafted to combine its exceedingly wide field of view with all the contrast, color-rendition, distortion correction and center-to-edge sharpness needed to achieve that natural view. Beyond the desire to simply achieve 110 degrees, the extended field of view gave Tele Vue the ability to produce a superb planetary eyepiece with a deep sky true field of view that logically fits within the rest of the Ethos eyepiece line.
With 110 degrees, the Ethos-SX has 21 percent more AFOV area than the 100 degree Ethos design. This permits a nice 62 percent power increase from a 6 mm Ethos, while retaining 68 percent of its TFOV. The 3.7 mm actually has more TFOV than 8 mm Plossl, 6 mm Radian, and 5 mm Nagler Type-6!
The 3.7mm is a 1.25" format and is parfocal with the wide range of 1.25" Tele Vue Plossls, Panoptics, Radians, Naglers, Nagler Zooms, and 6 mm and 8 mm Ethos eyepieces. The screw-on 2" adapter (included) is designed to make it parfocal with 13 mm and 10 mm Ethos when they are used in their 2" modes.
Tele Vue 3.7 mm Ethos-SX Specifications...
- Model: 3.7 mm Ethos-SX 110 (Simulator eXperience)
- Apparent field: 110 degrees
- Focal length: 3.7 mm
- Effective field stop diameter: 7.04 mm
- Eye relief: 15 mm (accepts DIOPTRX eyesight astigmatism corrector)
- Weight: 1.10 lb/ 17.7 oz; 2" adapter/stand: 2 oz
- Size Barrel: 1.25"
- Includes 2" adapter
OPT Product Number: TE-ETH-03.7