Eyepiece SMC Pentax XF ZoomDesigned for use with the PENTAX PF-65ED and PF-65EDA spotting scopes the smc PENTAX XF8.5 XF12 and XF Zoom Eyepiece 6.5mm-19.5mm feature multi-coated optical elements an American-standard 31.7mm (1.25 inch) sleeve and focal lengths ideal for outdoor viewing and bird watching.The XF8.5 and XF12 are standard unifocal eyepieces offering a focal length of 8.5mm and 12mm and a magnification of 46 and 32.5 times respectively with a 60-degree apparent field of view and a long 18mm eye relief. They also feature an extendible eyepiece ring with four click-stop positions.The XF Zoom Eyepiece 6.5mm-19.5mm features a focal-length range of 6.5mm to 19.5mm for a magnification of 20 to 60 times with an apparent field of view of 42 to 60 degrees and an eye relief of 11mm to 15mm. It also offers a user-friendly rubber eyepiece ring that never becomes too cold to touch while minimizing the risk of scratching the observers eyeglasses.These eyepieces also come with a filter-mounting screw and an adapter-mounting screw.SpecificationsLens Structure - 6 elements in 4 groupsAttachment Diameter - 31.7mm (1.25 inches)Length & ExternalDiameter - 88 x 50mm3.5 x 2.0 inchesWeight - 240g (8.5 oz.)Screw Diameter forAdapter - M43 =0.75Magnification (in Pentax 65 Spotting Scope) - 20 x - 60 xReal Field of View - 2.1? - 1?Apparent Field of View - 42? - 60?Field of View at 1000m(at 1000 yard) - 37m - 17 m(117 - 51 feet)Exit Pupil - 3.2 - 1.1mmEye Relief - 11-15mmRelative Brightness - 10.2 - 1.2
