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

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• 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 

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