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Kellner-type design with fully coated optical elements in a twist focus barrel mount. With diopter scale (+2 to -2) and retractable eyeguard.
#37-918 comes with the same specifications as #41-394, but with 1 1/4" OD adapter base to fit American Standard telescopes and optical instruments. A 17mm glass crossline reticle is mounted in the eyepiece.
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