Description The FS series of apochromatic refracting telescopes from Takahashi provides a balance of high performance, compact size, and low cost. At its heart is a two-element fluorite lens set that provides outstanding performance for both visual and imaging applications. The FS series has a modular design that makes use of several reducers, extenders and flatterers to further enhance its capabilities and versatility. FS-60CB The FS-60CB is a 60mm refractor that employs a multi-coated, two element fluorite objective lens with a prime focal length of 355mm. With the dedicated C0.72X reducer, the FS-60CB is converted to an f/4.2 instrument. The combination results in a 40mm diameter image circle with 60% illumination and star images within 20 microns across the entire field. Illumination is maintained at 95% or more out to a 25mm diameter, and is 72% illuminated out to a diameter of 35mm. With the dedicated FS-60 flattener, the resulting field flatness is greatly improved out to the four corners of a full frame DSLR sensor. The resulting combination is an f/6.2, 374mm instrument with an image circle diameter of 44mm. FS-60Q By attaching the Extender-CQ1.7X, the FS-60CB is converted into an FS-60Q, a 600mm f/10 telescope consisting of one fluorite element, with a flat field across the image circle. This extender fits between the FS-60 objective and the focuser, creating a unique 4-element-in-2-groups apochromat that is physically shorter than conventional 60mm f/10 refractors. Optical Tube Assembly only (reducers and flatteners, mount, tripod, tube holder and finder sold separately). Specifications Telescope FS-60CB FS-60Q Part Number TSK06010 TSK06110 Aperture 60mm 60 mm Resolution 1.93" 1.93" Limiting Magnitude 10.7 10.7 Light Gathering Power 73X 73X Focal Length 355 mm 600 mm Focal Ratio f/5.9 Configurable to f/4.2, f/6.2, f/10 f/10.0 Configurable to f/4.2, f/5.9, f/6.2 Optical Type Fluorite Doublet Apochromat Fluorite Apochromat: 4 Elements in 3 Groups Tube Diameter 80 mm 80 mm Tube Length (With Lens hood retracted) 440 mm 550 mm Tube Weight 1.4 kg 1.6 kg Recommended Finder 6x30 6x30 Metal Back Distance 162.0 mm 158.4 mm Telescope Specifications FS-60CB Visual System Chart FS-60CB Extender-Q System Chart FS-60CB Extender C2X System Chart
