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The 2" diameter barrel 100°-Series 20mm Eyepiece from Explore Scientific
is an ultra-wide field telescope eyepiece designed for planetary and
deep-space observations. Its wide exit pupil 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 multicoated 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, argon-filled body for water and fogproof
performance when used in extreme temperatures and climates, and a
double-tapered barrel for smooth insertion and removal from the focuser.