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. Suitable for observing a variety of celestial targets. 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. High magnification for eyepieces to see more details of the moon; bands of Jupiter clearly; SVBONY 2x barlow lens is a better choice. With T/T2(M42x0.75mm) male thread for T/T2 connectors. Barlow lens has a T mount adapter so you can attach a DSLR camera with an available T-mount. Completely multi-coated and pure optical glass lens for optimum image brightness high contrast.Clear and bright images can be obtained for moon, stargazing, etc. Cemented doublet optic structure reduce the chromatic aberration with the increase of magnification. SVBONY universal cell phone adapter mount makes it easy to position a point and shoot for high magnification photography. Make your mobile phone into a video camera and images capturer; so that you can explore the nature world easily through the screen. Steps to install the phone: 1.Pull the phone support plate to the maximum (3.93in wide). 2.Put the phone in to fix it. 3.Turn the screw under the phone support plate to adjust the phone so that the camera of the phone is aligned with the eyepiece.