SVBONY Zoom Eyepiece 1.25inch 7-21mm 60°- 40° FOV Fully Multi-Coated 7-Element

7-21 zoom eyepiece; allows you to change magnification power without swapping out eyepieces; 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;
7-Elements/4-groups structure; made of high index glass deliver sharp, high contrast vistas;
A simple twist of the zoom eyepiece housing changes the focal length from 7mm to 21mm, providing a variety of viewing magnification powers;
15mm long eye relief; 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;
M28.5*0.6 standard thread; convenient for connecting filter; compatible with 1.25-inch telescopes and accessories; works great for photography.