10x two element eyepiece

Details 10x two element eyepiece 10x two element eyepiece

G - Physics

02

B

88/99

G02B 21/02 (2006.01) G02B 25/00 (2006.01)

Patent

CA 1079556

ABSTRACT OF THE DISCLOSURE A two element 10X eyepiece has a field of view of about 44° and provides a wide field (20mm) with lenses having curve-diameter ratios considered desirable from a manufacturing view. The eyepiece is well-corrected for coma, astigmatism, distortion and color, having a focal length F and two lens elements aligned along an optical axis extending from the focal plane of the eyepiece. A double convex positive singlet I is the first element and a convex-plano positive doublet is the second element to provide a Petzval radius of 1.42F and eye-relief of 0.78F.

258075

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