Zoom from low power to high power instantly with SVBONY SV135 1.25 inch zoom eyepiece. SV135 fully multi-coated zoom plossl eyepiece zooms to any focal length between 7 mm and 21 mm. Pick the best magnification for your object and enhance your view! SV135 zoom eyepiece has M28.5*0.6 threads on the bottom very convenient for connecting filter; compatible with 1.25-inch telescopes and accessories; works great for photography. 15mm long eye relief distance ensure relaxing observation and keep your eyes comfortable, especially for users who wear glasses; the rubber eye guard provides comfort and blocks unwanted stray light. SV135 zoom eyepiece could bring you a better observation experience in a comfortable situation with high-contrast imaging; designed primarily for viewing lunar surfaces; jupiter and saturn; nebulae; clusters; and diffuse nebulae. This SVBONY red laser collimator has a 1.25" barrel and comes with a 2" adapter. It is suitable for both 1.25" and 2" Newtonian reflector telescopes. When you upgrade your 1.25" telescope to a 2" telescope, you do not need to buy an additional collimator to calibrate the 2" telescope. This is a newest 1.25" laser collimator includes removable 2" adapter;the triple cemented lens to improve the stability of dot;it's designed for accurate collimation of all Newtonian and SCT reflector telescopes. SVBONY Red Laser Collimator is made of all-metal material and has a long service life.