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Parfocal eyepiece require little to no focusing when changing from low to high power
A "must" have accessory for reflector telescopes
Ergonomic Design
vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology
Explore Scientific 50mm Finderscope Rings for Right Angle Finder - FNDRRGSRA temp-no-channels-products Parfocal eyepiece require little toAbout the Explore Scientific 50mm Finderscope Rings for Right Angle Finder Explore Scientific Finderscope Rings are all made for 50mm finders. Choose from a classic low profile bracket (about an inch tall), one that is a tad higher (1. 5") or a high profile bracket that stands 4" above the finderscope base. Regardless of the height you choose, these Explore Scientific Finder Brackets have two rings to hold your finder firmly yet gently, and each ring
