Optec MAXfield 0.33X telecompressor (focal reducer) for SCT's with mounting adaptor specific for SBIG ST-237A. Excellent (like-new) condition. The 3-element Optec lens system turns an f/10 SCT into a fast f/3.3 system with 9-fold increase in field of view. Note that adaptors for other CCD cameras are available from Optec (see their website). Optics designed specifically for C8, C-9.25, C-11, C-14, and Meade SCTs.
$135 shipped (includes MAXfield optics + ST-237A-mounting adaptor). Will accept Paypal.