Borg 71FL f/4 Astrograph with M75 Helical Focuser OTA Set

Borg 71FL f/4 Astrograph with M75 Helical Focuser OTA Set

£1,549.00✓ 2 year warranty

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About this product

Model:  borg_71fl_80mm_f4_m75_set
Part Number:  69711

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

Includes a Borg M75 Helical focuser for precise dependable focusing. 

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

Specification

  • 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, 7875, 7051, 7026, 7801, 7507, 7352, 7872 & 7000

71mm Flourite Objective

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

Precision helical focuser

  • 125mm to 155mm long (30mm focus travel)
  • M75 male/female (reversible)
  • Finest pitch among BORG helical focuser family -- 1mm focus travel for 15mm (18°) of rotation of the focusing tube (OD 98mm)

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

What's in the box

  • 2573 - 71FL Flourite Objective
  • 7875 - M75 Helical Focuser
  • 7051 - 80mm Dia. 50mm Tube
  • 7026 - 80mm Dia. 25mm Tube
  • 7801 - M77.6 to M68.6 Adapter
  • 7507 - M68.8 to M57 Adapter
  • 7352 - M57 Rotating Ring DX
  • 7872 - 0.72x Quadruplet Reducer
  • 7000 - SLR Camera Mount Adapter

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