100° & 110° Apparent Field Eyepieces Eyepieces > Ethos > 3.7mm
Model #ETH-03.7
Focal Length (mm)3.7
Barrel Size (in.)2" & 1"
Apparent Field of View (deg.)110
Eye Relief (mm)15
Weight (lb / oz)1.10 / 17.6
Field Stop (mm)7.04
Compare to similar focal lengths
“Best high power views ever. I am seeing more detail and brighter too. Better than I hoped for. Thanks Tele Vue.”
—C.A., Canada

With 110°, the Ethos-SX has 21% more AFOV area than the 100° Ethos design. This permits a nice 62% power increase from a 6mm Ethos, while retaining 68% of its TFOV. The 3.7mm actually has more TFOV than our 8mm Plössl, 6mm Radian, and 5mm Nagler Type-6!

In 1¼" mode, it is parfocal with the wide range of 1¼" Tele Vue Plössls, Panoptics, Radians, Naglers, Nagler Zooms, and 6mm and 8mm Ethos eyepieces. The screw-on 2" adapter (included) is designed to make it parfocal with 13mm and 10mm Ethos when they are used in their 2" modes.

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Ethos 3.7mm was firs...
Ethos 3.7mm was first shown at NEAF 2010.

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