Baader Morpheus 17.5mm 76° Wide Field Eyepiece - MORPH-17 vendor-televue use them with the appropriate

use them with the appropriate Explore Scientific Focal Extender

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or any other eyepiece with an outside diameter of 45 mm or smaller (such as a binocular or telescope eyepiece)

Baader Morpheus 17.5mm 76° Wide Field Eyepiece - MORPH-17 vendor-televue use them with the appropriateBaader Morpheus 17. 5mm 76 Wide Field Eyepiece This Baader Morpheus eyepiece has a focal length of 17. 5mm, and like all Morpheus Eyepieces comes with a 1. 25" and 2" barrel plus an M43 adapter for photographic use and a holster type case to keep your 17. 5mm Morpheus Eyepiece safe when not in use. Full Field Sharpness: The sharp flat 76 field is unsurpassed by any other modern wide field eyepiece. On axis sharpness and contrast rivals our best