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To optimize the performance of Pentax PF-65ED and PF-65ED-A Spotting Scopes, Pentax has developed Pentax XF 8.5 Eyepiece 70531 featuring a bright, high-contrast image, an American-standard 31.7mm sleeve and focal lengths ideal for outdoor viewing and bird watching.
With a focal length of 8.5 mm , the high-performance PENTAX XF8.5 eyepiece is ideal for outdoor viewing and bird watching. As a standard Unifocal Eyepiece it offers a 60 degree apparent field of view, long eye relief, and bright, high-contrast images.