SVBONY 68 degree ultra wide long eye relief eyepiece with a comfortable wide field for planetary observing Super wide 68 degree apparent field offers expansive views of the moon;star clusters;and the Milky Way It helps gets sharpness;high contrast and orthoscopic images;it can be used in any astronomical telescopes that fits for standard 1.25" eyepieces 68 degree ultra wide FOV: Comfortable ultra-wide field that naturally more poerful to get bright and sharp viewing Fully multi coated lens: Observation without introducing additional chromatic aberration;make image more sharper Broadband green film optical glass: Chromatic corrected;high transmittance to achive clear and sharp viewing 6/9/15/20mm eyepiece set: Low;medium and high powered magnification for a wide range of viewing;enhance the visual experience Optical structure design: Multi-element design;highly achromatic;it delivers sharp images and enhance the details of planetary filters,Soft rubber eye guard Fold down soft rubber eye guard is more comfortable for eyeglass wearers Features --Dielectric coatings provides 99% reflectivity --M28.5x0.6 filter thread can connect with 1.25in filter directly --Built-in brass ring to prevent the accessories barrel from being scratched --Machined and anodized aluminum housing make the SV188P dielectric diagonal durable and uniform Compatible with Telescope 1.SV188P 1.25in dielectric diagonal compatible with any 1.25in refractor telescope 2.SV188P can not connect with the SCT telescope directly, the additional adapter is required if you want to connect SV188P with the SCT telescope 3.SV188P does not fit for reflector telescope