This 8.5mm focal length Pentax eyepiece is physically sized for use with the compact 65mm Pentax spotting scopes. It can also be used with the 80mm and 100mm Pentax scopes if the size and weight of the larger XW eyepieces normally used with them becomes an issue with those models. It provides a healthy 46x magnification with the 65mm Pentax scopes, and its 60° apparent field of view provides an actual 1.3° field (68’ @ 1000 yards) at that power. (It provides 59x and a 53’ field with the straight-through 80mm Pentax scope, 61x and a 52’ field with the straight-through 80mm Pentax, and 74x and a 43’ field with the 100mm Pentax.)
The eyepiece has a reasonable 14mm of usable eye relief for those who must wear eyeglasses while observing due to astigmatism, although the field of view will be vignetted for eyeglass wearers. Those who do not wear glasses will find the long eye relief a comfortable change from the cramped eye relief that is typical of the usual short focal length eyepiece. It has a twist-up eyecup with four click-stop height positions to match the eye relief to your particular preferences.
All lens elements (a sophisticated 6 lens/4 group design) are fully multicoated with Pentax SMC (Super Multi-Coated) high transmission antireflection optical coatings for maximum light transmission and contrast. High refraction/low dispersion lanthanum ED glass elements are used for excellent color fidelity. The eyepiece is specially sealed to be weatherproof under the worst observing conditions a birder might encounter, short of total submersion. Protective caps are provided for both ends of the eyepiece.
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