Product Details

• Description
• Specifications
• Included Items
• Reviews

• 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

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• specifications

  Aperture	107 mm (4.25")
  Back Focus	80mm
  Corrected Image Circle	55mm
  Dawes Limit	1.08 arcseconds
  Focal Length	417 mm
  Focal Ratio	f/3.9
  Highest Magnification	214x
  Light Gathering Power	234x
  Limiting Magnitude	13.9
  Optical Design	Petzval Refractor
  Tube Length	445mm
  Tube Weight	9.5 lbs

• included items

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