The RACI Illuminated 9x50 Finderscope from Celestron is specially designed telescope accessory for comfortable and intuitive use with Schmidt-Cassegrain optical tubes. This Right Angle Corrected Image (RACI) device makes it easier for an observer to locate a celestial body through the finderscope when the optical tube is pointed toward zenith. The RACI corrects its transmitted image so the field of view always appears upright, which enables more intuitive telescope adjustments.
In addition to the right-angle configuration and corrected image, the RACI finderscope's illuminated dual crosshair reticle helps the observer pinpoint their subject of interest and center it within the telescope's field of view. A rotating eyepiece assembly allows the observer to customize the viewing orientation, and an included dovetail mounting bracket permits easy attachment to the optical tube, making the RACI finderscope a user-friendly accessory for those stargazers operating a Schmidt-Cassegrain telescope.