The Telescope Authority
Since 1947

View Shopping Cart

Your Cart is Empty

Borg 107FL F3.9ED Astrograph - Feather Touch Focuser

Brand: Borg

SKU : BG-B10739F

- Read
Add to Wishlist

Request stock alerts and we'll let you know when the item is back in stock

Got questions? Click for live chat

  • Telescope Aperture: 107 mm
  • Telescope Focal Ratio: f/3.9
  • Telescope Focal Length: 420mm
  • FeatherTouch True 3-inch focuser
  • Covers sensor diagonals up to 55 mm 

Product Details

  • 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 that can support very large image circle of up to 55mm.

    • 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) comes installed
    • 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 tube rings, the Borg can use the PrimaLuceLab 115 mm PLUS Support rings:  PLL-PLLANSU115P


  • specifications

    Aperture107 mm (4.25")
    Back Focus80mm
    Corrected Image Circle55mm
    Dawes Limit1.08 arcseconds
    Focal Length420mm
    Focal Ratiof/3.9
    Highest Magnification214x
    Light Gathering Power234x
    Limiting Magnitude13.9
    Optical DesignPetzval
    Tube Length445mm
    Tube Weight9.5 lbs
  • included items

    • BORG 107FL F3.9ED Astrograph Optical Tube
    • Feather Touch Focuser (FTF-3215B-A) as standard
    • 21-inch-long carrying bag
    • M57 camera rotator


Product Reviews