Svbony SV135 Zoom Telescope Eyepiece Inch FMC Focal Length Viewing Angle for Astronomical Telescope Moon and Planet Observation Zoom Eyepiece 1.25

【Standard Size】Standard 1.25" (31.7mm) fitting diameter. Can be used with any astronomical telescope with a 1.25" focusing device. 【Zoom Focal Length】Adjustable focal length from 7 mm to 21 mm. 7-21 mm zoom eyepiece equivalent to multiple eyepieces, short focal length for high magnification. High contrast imaging can bring you a good viewing experience. [Excellent optical quality] Built-in FMC multilayer coating on the high refractive index rhythm transmission surface minimizes chromatic aberration and provides a bright and natural view. [Applicable scenes] Ideal for observing the moon, as well as medium-sized star clusters, wide cloudy nebulae, and deep sky observation. The zoom eye relief of 16.3 mm to 18 mm provides a comfortable visual experience that reduces fatigue even when observing for long periods of time. [Safety Guarantee] Our products are sold in 11 countries and are widely recognized. There is a 12-month worry-free warranty, so if there is any problem or damage with the product, please feel free to contact us. We will always do our best to provide warranty service.