The FR237 Focal Reducer and eFinder Assembly is actually two accessories. It is a variable focal reducer that will reduce an F/10 optical system to F/3.75 and it is an ultra compact wide field telescope that may be used for imaging, an electronic finder or autoguiding. The assembly consists of an achromatic focal reducer lens, a 4 inch "eFinder" extension tube, and a short 1.25" extension tube. Comes with plastic lens cap. May be used with the STV; ST-237; ST-237A; ST-5C and Pixcel 255.
Mint condition. $165 includes insured shipping in CONUS. Paypal (credit card ok, no surcharge), or money order/cashier's check.