Televue Ethos 100-deg FOV Eyepiece - 3.7mm

Model # ETH-03.7
Focal Length (mm) 3.7
Barrel Size (in.) 2" & 1¼"
Apparent Field of View (deg.) 110
Eye Relief (mm) 15
Weight (lb / oz) 1.10 / 17.6
Field Stop (mm) 7.04

SPECIAL ORDER - Please contact us to make arrangements.

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.