Borg 90FL f/4 Astrograph with M75 Helical Focuser OTA Set

Borg 90FL f/4 Astrograph with M75 Helical Focuser OTA Set

£2,198.00✓ 2 year warranty

:  

Special shipped 10-15 working days.

About this product

Model:  borg_90fl_f4_m75_set
Part Number:  69901

Japanese made Borg 90FL 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: 90mm
  • Focal length: 360mm
  • F-ratio: 4
  • Lens configuration: 6 elements in 5 groups
  • Coating: Fully multi-coated
  • Physical length: 385mm
  • Tube diameter: 80mm
  • Weight: 2.1kg
  • Filter: 82mm (front cap) & 48mm in front of reducer
  • Parts included: 2591, 7875, 7051, 7026, 7801, 7507, 7352, 7872 & 7000

90mm Fluorite Objective

  • Focal length : 500mm
  • F-ratio : 5.6
  • Weight : 950g
  • Length : 145mm

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

  • 2591 - 90FL 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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