The PENTAX XF Zoom eyepiece provides magnification of 20 to 60 times with the PENTAX 65mm spotting scopes, an apparent field of view of 42 to 60 degrees, and an eye relief of 11mm to 15mm. It also features a rubber eyepiece ring designed for comfortable viewing even with eyeglasses. Compatible with the following: PF-65 and PF-65 ED II series spotting scopes, PF-80 series spotting scopes, PF-100 series spotting scopes.