Designed for deep-sky imaging with Schmidt-Cassegrain telescopes, the Radial Guider lets you photograph and guide simultaneously, whether manually or with the aid of an autoguider. It eliminates the problem of differential flexure, which can occur when using a separate guidescope. The Radial Guider is compatible with a 1.25" illuminated reticle eyepiece or an autoguider with a 1.25" nosepiece. The housing threads onto the rear cell of the telescope and has threads for attachment of a camera T-ring (sold separately). The guiding eyepiece can be adjusted radially for easy guide star acquisition.