BORG 107FL F3.9ED Astrograph

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  • $3,995.00
  • Regular price $4,495.00

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Accessories Added

  • Telescope Aperture: 107mm
  • Telescope Focal Ratio: f/3.9
  • Feathertouch True 3″ focuser
  • Covers sensor diagonals up to 55mm 


BORG 107FL F3.9ED Astrograph

The BORG 107mm F3.9 Astrograph is a very unique 4" 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.

  • 107mm aperture
  • 6-element advanced Petzval optical system, including one fluorite and one ED elements
  • Covers up to a 55mm diagonal sensor
  • Japanese-made high quality carbon fiber tube
  • Feathertouch True 3″ focuser (FTF3215B-A)
  • M57 camera rotator included
  • Back focus : 60mm from M57 camera rotator thread
  • 21″ long carrying bag
  • Fits 115mm ID mounting rings (optional)


Aperture107 mm (4.21")
Back Focus80mm
Corrected Image Circle55mm
Dawes Limit1.08 arcseconds
Focal Length417 mm
Focal Ratiof/3.9
Hightest Magnification214x
Light Gathering Power234x
Limiting Magnitude13.9
Optical DesignPetzval
Tube Length445mm
Tube Weight9.5 lbs


  • BORG 107FL F3.9ED Astrograph Optical Tube
  • Feathertouch True 3″ focuser (FTF3215B-A)
  • 21″ long carrying bag
  • M57 camera rotator


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