Tele Vue Radian 18mm Wide Angle Eyepiece (1.25") (Pre-owned) Sloan Filters The prime focus focal plane

The prime focus focal plane is located near the front aperture of the optical system

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Tele Vue Radian 18mm Wide Angle Eyepiece (1.25") (Pre-owned) Sloan Filters The prime focus focal planeUsed eyepiece in excellent condition. The Radian 18. 0mm eyepiece, for many, is the ideal compromise. It has 20mm of eye relief and an apparent field of view of 60, while not being too heavy. Wide, comfy and relatively light! All glass surfaces are multicoated Blackened lens edges enhance contrast Fold down rubber eyecup Accept standard 1. 25" astronomy eyepiece filters Tele Vue ERD 18. 0 Specs Focal Length 18. 0mm Eye Relief 20. 0mm Apparent Field of