BORG 107FL F3.9ED Astrograph

  • Telescope Aperture: 107 mm
  • Telescope Focal Ratio: f/3.9
  • FeatherTouch True 3-inch focuser
  • Covers sensor diagonals up to 55 mm 
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  • Regular price $4,595.00

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BORG 107FL F3.9ED Astrograph

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

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


Note: If you need rings, the Borg can use the PrimaLuceLab 115 mm PLUS Support rings:  PLL-PLLANSU115P



Aperture107 mm (4.25")
Back Focus80mm
Corrected Image Circle55mm
Dawes Limit1.08 arcseconds
Focal Length417 mm
Focal Ratiof/3.9
Highest 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-inch focuser (FTF3215B-A)
  • 21-inch-long carrying bag
  • M57 camera rotator