The Takahashi FCT-76 is a fluorite triplet apochromat refractor. Specifications Aperture :  3 in. [76mm] Focal Length :  19.2 in. [487mm] Focal Ratio @ Prime Focus :  f/6.4 Prime Focus Photographic Field :  4.8° Focal Ratio w/Reducer :  f/4.5 Photographic Field w/Reducer :  8.4° Limiting Magnitude :  ~ 11.6 Resolving Power :  1.5 arc seconds Lowest Useful Magnification :  11x Highest Useful Magnification :  152x Tube Diameter :  3.7 in. [95mm] Tube Length :  17 in. [432mm] We

The Takahashi FS-60CB is a fluorite doublet apochromat refractor.  [Image Credit: Takahashi] . Specifications Aperture :  2.4 in. [60mm] Focal Length :  14.0 in. [355mm] Focal Ratio @ Prime Focus :  f/5.9 Prime Focus Photographic Field :  5.0° Focal Ratio w/Reducer :  f/4.4 Photographic Field w/Reducer :  7.0° Limiting Magnitude :  ~ 10.9 Resolving Power :  2.2 arc seconds Lowest Useful Magnification :  8x Highest Useful Magnification :  120x Tube Diameter :  3.1 in. [80mm] T

The Takahashi FSQ-85ED is a Modified Petzval quadruplet apochromat refractor [Image Credit: Takahashi]. Specifications Aperture:  3.3 in....