1.25" Bino Viewer Binocular Viewer for Astronomical Telescopes Monocular Turn To Binoculars AdapterFull metal structure, lightweight design,20mm caliber, BAK-4 prism, full broadband green film52-75 mm to facilitate extensive1.25-inch standard socket with standard filter threadAllows you to adapt two eyepieces to your telescope and view with both eyes simultaneouslyDesigned to fit into a standard 1.25" eyepiece tube.This binocular attachment features high quality BAK-4 prisms for clearer, sharper images.An excellent accessory which helps to reduce eyestrain. Eyepiece diopter scales for sharp focus.Give the widest viewing field along with extra sharpness and long eye reliefPackage Included:1 x Astronomical Bino cular ViewerNote:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.