Borg 55FL F3.6 Astrograph with Feathertouch Focuser

ITEM #
BG-B5536FTF-DB
  • Choose your accent color: Sunrise Blue or Sunset Orange
  • Telescope Aperture: 55mm
  • Telescope Focal Ratio: f/3.6
  • 43mm corrected image circle
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  • Regular price $1,795.00

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Borg 55FL F3.6 Astrograph with Feathertouch Focuser

The BORG 55mm F3.6 Astrograph is a very unique portable telescope. Boasting a small size for easy transportation (including airline and overseas expeditions), this astrograph is the perfect telescope for those needing a portable, high-quality optical tube.

  • 55mm aperture
  • 6-element advanced optical system, including one fluorite
  • Japanese-made high quality carbon fiber tube
  • Feathertouch Focuser - M57
  • M57 camera rotator included
  • Back focus : 60mm from M57 camera rotator thread

SPECIFICATIONS

Aperture55 mm (2.25")
Back Focus60mm
Corrected Image Circle43mm
Dawes Limit2.11 arcseconds
Focal Length200 mm
Focal Ratiof/3.64
Highest Magnification110x
Light Gathering Power62x
Limiting Magnitude12.5
Optical DesignPetzval
Tube Diameter80mm
Tube Length210mm
Tube Weight2.7 lbs

INCLUDED ITEMS

  • BORG 55FL F3.6ED Astrograph Optical Tube
  • M57 camera rotator
  • Feathertouch Focuser - M57
Customer Reviews
5.0 Based on 1 Reviews
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CF
08/20/2019
Charles F.
United States United States
Great fast, wide-field scope

I appreciate the tough design challenges to pack so much into a compact, wide-field scope. I'm an experienced imaging with longer focal length scopes, so this was a challenge. Getting a flat-field across entire image circle is challenging, but with persistence I have it acceptable (very slight star elongation in one corner but can live with it for now, haven't had time to debug/test what is wrong if it is tilt or backfocus wrong on my adapters). Adapters for the scope are available, although M57 is not a popular size so very limited adapters other than from Hutech. I think this will be a keeper in my collection.