Celestron Radial Guider

Star guide!
Developed primarily for use in prime focus, deep-sky imaging or astrophotography with Schmidt-Cassegrain telescopes, Celestron's Radial Guider is compact and sleek in design. It allows you to photograph and guide through the optical tube assembly of your telescope simultaneously, ensuring the highest-quality images. It virtually eliminates differential flexure, too, because guiding and photographing both take place through the telescope.
The radial guider is compatible with Celestron's C5, C8, C9ﾼ, C11 and C14 telescopes and comes with a unique prism-angle adjustment screw. It must be used with a guiding eyepiece, camera T-Ring and drive corrector (dual axis preferred). It's primarily for use with catadioptric telescopes, but it also works on refractor telescopes having adequate back focus.
Celestron's radial guider is a tremendous improvement over conventional off-axis guilders. Not only does it enable you to vary the angle of the prism, but it maintains a fixed camera orientation while offering users the freedom to move the guiding eyepiece radially about 135 degrees.
The Celestron radial guider is a must-have accessory for all astrophotographers and imagers!