Pentax XW 3.5 SMC Eyepiece (1.25" Tube)

The Pentax XW3.5 spotting scope eyepiece is a fixed 3.5mm telescope lens for the Pentax 65- (111x) and 80mm (144x) ED spotting scopes. Made with the same ED glass as the scopes themselves, the XW3.5 eyepiece provides high-resolution images with minimal distortion or chromatic aberration. The Pentax XW3.5 eyepiece is a fully multi-coated lens that is weatherproof to meet Japan Industrial Standard Class 4 specifications. All XW models feature a 70-degree apparent angle of view. Laminated optical elements are treated with the innovative partial coating, which offers much higher light transmission capability than conventional full-surface coating. Thanks to advanced computer simulation technology, internal reflections are drastically reduced to produce brighter, clearer images. Lens Structure - 8 Elements 5 Groups Focal Length - 3.5mm Apparent Field of View - 70 Degrees Eye Relief - 20mm Attachment Diameter - 1.25" (31.7mm) Filter Diameter - 28.6mm Field Stop Diameter - 4.3mm Weight - 14.3 oz. (405g)