TAKAHASHI   FS-60CB

The FS-60CB replaces the very popular FS-60/FS-60CSV, simply in the length of  the main tube (see comparison info on pdf file below)

In addition to there being a field flattener for CCD imaging, a 0.72x focal reducer has been announced, which provides amazing wide-fields of  view due to the very short focal length of only 264mm, and fast at f/4.4. Below is a beautiful image of  the Veil Nebula by Bob Winter , using the focal reducer on his FS-60CB

 

 

Click on image to enlarge.  Camera was QSI 583, LRGB image using Ha and OIII CCD

 

 

System Chart, and comparison with FS-60C (pdf)

Photo-visual chart (pdf)

Extender C x2 system chart (pdf)

 

Specification

 

Objective  60mm fluorite doublet

Focal length/focal ratio    355mm f/5.9

Resolving power - 1.9" of arc

Overall length - 440mm

Weight - 1.4Kg

1.25" eyepiece adapter standard

 

Optional prime focus field flattener - focal ratio 370mm, f/6.2, image circle 45mm

Optional focal reducer - 0.72x,  focal ratio 264mm, f/4.4, image circle 44mm

Optional x2 doubler - focal ratio 710mm, f/11.8, image circle 35mm

 

See  price list  for full details.  Tube assemblies are at the start of  the price list, accessories at the end of the price list.

See also photo visual chart above

 

 

                        

FS-60 on camera tripod            FS-60C on  TGSP-II mount             Photo-Visual Chart

 

The amazing FS-60C is a vesatile f/5.9 doublet,  and is the perfect small scope for  going anywhere, anytime.  The normal ota is supplied with a 1.25" focuser as shown.  The focal ratio is 355mm, and a field flattener is available for prime focus imaging.

One can go even wider field by use of  a  focal reducer/field flattener - see photo-visual chart above.

 

Specification

 

Objective  60mm fluorite doublet

Focal length/focal ratio    355mm f/5.9

Resolving power - 1.9" of arc

Overall length - 440mm

Weight - 1.4Kg

1.25" eyepiece adapter standard

 

Optional prime focus field flattener - focal ratio 370mm, f/6.2, image circle 45mm

Optional focal reducer - focal ratio 264mm, f/4.4, image circle 44mm

Optional x2 doubler - focal ratio 710mm, f/11.8, image circle 35mm

 

See  price list  for full details.  Tube assemblies are at the start of  the price list, accessories at the end of the price list.

See also photo visual chart above

 

          

CSV tube                      2" Back

 

For use with binocular viewers,  and some imaging applications that require more back-focus, an optional short tube (CSV) can be used.  The CSV tube is 105mm long compared to 145mm length for the standard tube. To change from standard to CSV tube simply unscrew the objective cell and focuser from the standard tube  and screw them onto the CSV tube- no collimation is required.

 

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