1.90 ° window: The astronomical uses a 90 ° window to make the observation process more convenient and the optical lens has a high light transmittance 2.Angle locking knob: The angle locking knob of the astronomical conforms to the grasping habit of fingers,and it is easy to lock for viewing 3.Broadband Blue Film: The use of Broadband Red Film for astronomical s can improve the light transmittance of the lens,making the light transmittance up to 93%,ensuring that the sights seen are clear and bright 4.More stable: Astronomical adopts aluminum alloy tripod,using aluminum alloy material,the triangle support is stable and firm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia