Borg 71FL f/4 Astrograph with Feather Touch Focuser OTA Set

Borg 71FL f/4 Astrograph with Feather Touch Focuser OTA Set


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Model:  borg_71fl_80mm_f4_ftf_set
Part Number:  71FTF4
Brand:  Borg



  • 2573 - 71FL Flourite Objective
  • 7151 - 80 Dia. 150mm Tube
  • FTF-BORGII - M77.6 FTF Adapter
  • FTF2020BCR - 2" Feather Touch Focuser
  • 7352 - M57 Rotating Ring DX
  • 7872 - 0.72x Quadruplet Reducer
  • 2x 7085 - Series 80 Mounting Ring

Japanese made Borg 71FL f/4 astrograph features a premium quality Fluorite objective from Canon with 80mm tube diameter.

Includes a Starlight Instruments Feather Touch 2" dual speed focuser with 2" of draw tube travel and a compression ring.

Modular Borg design allows you to reconfigure the scope for visual observing or to disassemble it for ultra portability.


  • Aperture: 71mm
  • Focal length: 280mm
  • F-ratio: 4
  • Lens configuration: 6 elements in 5 groups
  • Coating: Fully multi-coated
  • Physical length: 320mm
  • Tube diameter: 80mm
  • Weight: 1.4kg
  • Filter: 72mm (front cap) & 48mm in front of reducer
  • Parts included: 2573, 7151, FTF-BORGII, FTF-M57, 7352, 7872 & 2 x 7085

71mm Flourite Objective

  • Focal length: 400mm
  • F-ratio: 5.6

0.72x Reducer

  • Four-element reducer
  • Back focus distance: 60mm
  • Image coverage: Full frame
  • Objective side interface: M57 male
  • Camera side interface: M57 female

Telescope Field of View Simulator

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