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3mm Focal Length
Description N20839 Newtonian Item Number BR-N20839 Focal Length 812mm Focal Ratio f/3
an eyepiece and a red dot viewfinder
the 102mm is also compact enough to mount on a giant telescope
Explore Scientific 68° 40mm Waterproof Eyepiece GSO 3mm Focal LengthBe sure to add the Eyepiece Soft Case to your cart! Explore Scientific 68 40mm Argon Purged Waterproof Eyepiece Featuring this 68 40mm Argon Purged Waterproof Eyepiece by Explore Scientific. This is optimized to produce high contrast, high resolution, and superior flat field characteristics. With advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings. A truly full