The FR-237 focal reducer, extension tube, and eFinder assembly are for sale. The focal reducer was used 5 or 6 times and everything is still in mint condition and in the original box. It's designed for SBIG cameras but it works well in front of other cameras as well (I placed it in front of a Starlight Xpress HX916 the few times I used it). Comes with the extension tube and eFinder assembly tube (the extension tube was used a couple times, the eFinder tube was never used).
A slightly modified description from SBIG: The FR-237 focal reducer lens (included) threads directly into the 1.25" nosepiece of an ST-5C, ST-237, STV, PixCel 255 or PixCel 237. When the focal reducer lens is used on an f/10 SCT (for example), it will increase the field of view and reduce exposures by several times. It can provide unvignetted operation at f/5.95 or f/3.75 by selecting a fixed mechanical extension tube (included). The same lens when used with the eFinder assembly extension tube (included) turns the FR-237 lens into an ultra compact f/4 telescope of 100mm focal length for wide field views or autoguiding without an additional optical tube. (The focal reducer lens only may also be used with the ST-4 and old model ST-5 cameras).
The list price is $245 for the focal reducer, spacer, and eFinder assembly extension tube. Basically brand new, I'll sell mine for $140 or best offer. Money order prefered (I don't know anything about Paypal but maybe can be talked into it if it's most convenient for you).
Thanks for looking,