FS-60 Series Refractor Telescope

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 Specifications 
FS-60CB Visual System Chart

FS-60CB Extender-Q System Chart

FS-60CB Extender C2X System Chart