svbony telescope eyepiece fmc broadband green film telescope accessory 1.25 68 degree ultra wide angle eyepiece set for astronomical telescope(6mm 9mm 15mm 20mm) svbony svbony 68 degree ultra wide long eye relief eyepiece with a comfortable wide field for planetary observing<p> super wide 68 degree apparent field offers expansive views of the moon;star clusters;and the milky way<p> it helps gets sharpness;high contrast and orthoscopic images;it can be used in any astronomical telescopes that fits for standard 1.25" eyepieces<p> <b>68 degree ultra wide fov:</b><br> comfortable ultra-wide field that naturally more poerful to get bright and sharp viewing<p> <b>fully multi coated lens:</b><br> high quality observation without introducing additional chromatic aberration;make image more sharper<p> <b>broadband green film optical glass:</b><br> chromatic corrected;high transmittance to achive clear and sharp viewing<p> <b>6/9/15/20mm eyepiece set:</b><br> low;medium and high powered magnification for a wide range of viewing;enhance the visual experience<p> <b>optical structure design:</b><br> multi-element design;highly achromatic;it delivers sharp images and enhance the details of planetary filters,soft rubber eye guard<br> fold down soft rubber eye guard is more comfortable for eyeglass wearers<p> <b>specifications::</b><br> structure design: 5-elements in 3 groups (6mm)<br> 6-elements in 4 groups (9mm)<br> 4-elements in 3 groups (15mm)<br> 5-elements in 3 groups (20mm)<br> eyepiece series:68 degree ultra wide eyepiece<br> focal length:6mm/9mm/15mm/20mm<br> barrel size:1.25"/31.7mm<br> eye relief:17mm<br> apparent field of view:68 degree<br> lens material:optical glass lenses<br> body material:fully metal<br> filter threads:standard 1.25" filter thread<p><b>package includes:</b><br>1xsvbony 1.25" ultra wide 6mm eyepiece<br> 1xsvbony 1.25" ultra wide 9mm eyepiece<br> 1xsvbony 1.25" ultra wide 15mm eyepiece<br> 1xsvbony 1.25" ultra wide 20mm eyepiece