Borg 55FL F3.6 Astrograph with Feathertouch Focuser

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

More on the Way in 14 - 28 Business Days

Add to Wishlist
Already have gear? Trade it in for cash or new equipment.

Accessories Added

OPT Telescope Expert

Want Help?

Ask Our Telescope Experts


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


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


  • BORG 55FL F3.6ED Astrograph Optical Tube
  • M57 camera rotator
  • Feathertouch Focuser - M57
Customer Reviews
5.0 Based on 1 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
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.