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Ethos
100° & 110° Apparent Field Eyepieces
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17-mm
Model #ETH-17.0
Focal Length (mm)17
Barrel Size (in.)2"
Apparent Field (deg.)100
Eye Relief (mm)15
Weight (lb / oz)1.55 / 24.8
Field Stop (mm)29.6
Compare to similar focal lengths
“Decided to upgrade to Naglers & Ethos eyepieces. I enjoy viewing comets & deep sky objects and appreciate sharp images & wide FOV of Ethos.”
—T.A., IL
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The 17mm ETHOS is an ideal complement to the 31mm Nagler Type-5. They are parfocal (both have focus locations about 3/8" above shoulder) and the 31mm Nagler Type-5 has exactly twice the true field area.

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•Cleaning