EYEPIECE ZOOM EYEPIECE BLACK 25 INCH Function: 1. eyepiece with a full multi-layer coating, with the possibility of enlarging do any focal distance from 7 mm do 21 mm, choosing the best magnification for the object. 2. Do view the moon, planet, nebulae, star clusters and other celestial bodies and astronomical observations, large dispersion, wide field of view, very convenient. 3. Good build quality, suitable for 1,25 inch/31,7mm astronomical telescope. 4. Focal length eyepiece not only eyepiece, large magnification do small magnification, short focal length do telescope, easy proportion adjustment, very practical. 5. Professional production, metal body, surface coating, excellent optical performance. Specification: Item Type: Eyepiece Material: aluminum alloy optical glass Colour black Quantity: 1 piece Focal distance: continuous zoom 7-21 mm Lens coating film: broadband green film Weight: approx. 168g Interface size: approx. 31.7mm / 1.25 inch List of packages: 1 x Eyepiece Please be aware: