Astronomy telescope for beginners 400mm (f/5.7) focal length and large 70mm aperture, fully multi-coated optical glass lens with high transmission coatings creating stunning images with increased brightness and clarity. Come with two 1.25" replaceable eyepieces k20mm and k10mm for 20x and 40x views. 5x24 finder scope with mounting bracket and cross-hair lines inside make locating objects easily. Diagonal prism can get upright images. Cell phone Adapter with 1.5X Barlow lens which is a good solution to the fourth out-of-focus problems. telescope can set up quickly without additional tools. This telescope features a lightweight frame and a panning handle with Alt-AZ control for smooth and accurate pointing. Really friendly telescope for kids and beginners.