I am parting with my FCT-150 guider. 1990 Takahashi FC-100N 4-inch f/10 doublet fluorite apochromat. There are only 5 of these in the United States and only 100 were made from 1988 to 1991. This is model number 90005. Comes complete with Takahashi 6x30 finder and bracket, dew cap, FS-102/FS-Q/FC-100 tube ring, and Takahashi extension adapters. This refractor will preform to the absolute highest standards you can pit against a 4-inch objective. Has that "snap-focus" effect and a black background that you won't beleive. $3000 plus shipping and insurance.