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The 2" diameter barrel 92°-Series 17mm Eyepiece from Explore Scientific
is a wide-field telescope eyepiece with eight optical elements. It is
designed for planetary and deep-space observations. Its wide exit pupil
and long eye relief makes this eyepiece ideal for comfortable viewing
for extended periods. The contrast is enhanced by a fold-down rubber
eyecup that prevents stray light from leaking into your eye.
Anti-reflective multi-coated optics ensures bright, high-contrast
images with true color transmission across the entire wide field of
view. The eyepiece features a textured surface for a sure-grip when
changing it out, and it is argon-filled for water and fogproof
performance when used in extreme temperatures and climates.