C102 ED Refractor Optical Tube Assembly. One owner, purchased in 1996. It is a 4" F9 Doublet made in Japan (by Vixen). Very sharp and very high quality. According to one review "The C102ED I saw has superb optics. False color is almost non-existant..." etc. OTA comes with a Telrad base plate, mounting rings/ dove tail flange, and lens cap. A really fine scope for this price.