SVBONY 25mm telescope lenses 4-element plossl design for astronomy telescope; fully multi coated broadband green film optical glass and approx 40 degree filed of view for broad field lunar observations 4 element broadband green film optical glass: Premium symmetrical Plossl optical glass lens gets excellent aberration correction and extremely high resolution rivaling 25mm eyepiece with standard 1.25”interface: M28.5x0.6mm filter threads fits for any standard 1.25" telescope eyepiece filters or devices to the moon or celestial bodies 40 degree apparent field of view: Broad-field lunar observations of the Moon;planets;medium-sized star clusters;cloudy nebulas Blackened lens edges and blackened interior: The inside of the adapter is fully threaded to minimize reflections to reduce scattering of stray light and maximize contrast Foldable rubber eye guard are easier and more comfortable, especially for eyeglass wearers,No slip, rubber grip ring for secure handling, even in moist conditions The SVBONY fully metal 1.25" Mirrors Diagonal zenith mirror offers an upright figure which is but turned backward in left and right position. It is suitable in particular for astronomical observations. The mirror depicts clean and full of contrasts. The mirror is suitable for refractors, Celestron EQ, Meade Infinity and similar telescopes. It is not suitable due to the length reflectors for Newton. Includes Dustcaps for Storage Store your diagonal with two dust covers included for protection when you're not observing 90 Degree Comfortable Observation It can be used to observe objects with comfortable angle as you observe from above; it's convenient to look at the zenith of the sky and close to horizontal observation. Built-in Brass Ring Brass compression ring provides a uniform pressure receiving area when holding the eyepiece; fingertip screw clamps accessories effortless fixes more firmly and will not damage your eyepieces Built-in Matt Thread Effectively reduce stray light interfere