Borg 55FL F3.6 Astrograph with Helical Focuser

  • Telescope Aperture: 55mm
  • Telescope Focal Ratio: f/3.6
  • 43mm corrected image circle
  • Sale
  • Regular price $1,575.00

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Borg 55FL F3.6 Astrograph with Helical 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
  • Borg helical focuser
  • M57 camera rotator included
  • Back focus : 60mm from M57 camera rotator thread


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 Diameter60mm
Tube Length190mm
Tube Weight1.8 lbs


  • BORG 55FL F3.6ED Astrograph Optical Tube
  • M57 camera rotator
  • Mounting bracket