The ONLY off-axis guider for SCT scopes that's worth anything. This is in great condition and includes the wide field adaptor and the 4" extension tube (required for the ST-4 to come to focus). The wide field adaptor enables you to quickly remove the GEG and replace it with either a 2" or 1 1/4" eyepiece. Also includes the 2" - 1 1/4" adaptor as well as some extra brass and nylon thumbscrews. The case shown in the photo is not included but you can buy the same thing at Lowe's for $25!
$299 + shipping. Available immediately.