70MM large aperture adopts advanced optical lens group, high-quality optical glass multilayer broadband coating, so that the light transmittance can reach 98.9%, and the image is clear and sharp Specification Optical Design: Refractor Aperture: 70mm(2.75in) Findersc: 5*24 Focal Length: 400mm(15.75in) Eyepiece: K6mm, K25mm Mirrors: 45erect-image diagonal Item size: 435*160*110mm List: 1*smart phone adapter 1*camera shutter wire control 1*adjustable tripod 4*moon filters 2* eyepieces 1*45 erect image diagonal 1*5x24 findersc1*user manual 1*backpack Steps for usage: 1. step at the subject to be observed, adjust the appropriate height and 2. step The finder mirror is coaxial and parallel to the main lens barrel. Look at the finder mirror and adjust the up, down, left, and right angles through the tripod handle to find the position of the observation object 3. step Lock the observation object, watch the eyepiece of the main tube, and adjust the focus wheel to clear Reminder: Please wear a Bard film when observing the sun. Do not observe the sun directly, so as not to burn your eyes!