Pentax SMC XL 8-24mm (JIS Class 4, weather-resistant) eyepiece
Amazon.com : PENTAX smc PENTAX XW40-R, 2-Inch Eyepiece for Telescopes High-Performance Eyepiece with an Extra-Wide 70°Apparent Angle of View, 20mm Eye Relief Original Multi-Layer Coating All-Weather Made in Japan : Electronics