The extremely rare Takahashi 4-inch f/10 doublet fluorite apochromat. In 9++ condition. Included items: Telrad, Tak tube ring, 6x30 finder and bracket. $2400 for the full package with shipping/insurance included. I will sell for less if the potential buyer does not wish to have all the included accessories. E-mail or call for detailed elaboration and experience over this remarkable refractor.