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Cyclops Optics

William Optics GT71 71mm f/5.9 Triplet APO Imaging Package + FREE International Shipping


William Optics GT71 71mm f/5.9 Triplet APO Imaging Package + FREE International Shipping

Shipping Weight:
6.00 KGS
Accepting order now!
Calculated at checkout

Product Description

William Optics GT71 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. This package includes a 0.8x Flat6A-III reducer cum flattener specially designed for GT71 to transform it into a f/4.7 imaging APO covering full frame sensor.


  • GT-71 APO 3-element objective with FPL-53 extra low dispersion glass
  • Flat6A-III 0.8x reducer flattener 
  • 2.5" 1:10 rack & pinion focuser
  • Dual mounting rings with Vixen style dovetail bar
  • Guidescope mounting rings
  • 2" to 1.25" adapter with brass compression ring
  • Retractable lens shade
  • WO patented Bahtinov Mask Cover
  • High quality soft carrying bag


  • 71mm f/5.9 triplet air-spaced objectives APO
  • Includes 1 FPL-53 fluorite element
  • Very sharp image with excellent colour correction
  • Precision optics with fully multi-coated lenses using super-high transmission (STM) coating on all surfaces
  • Designed for astrophotography and visual observation

Cyclops Optics' Exclusive Fine Tuning Service

We offer fine tuning service for the telescopes to provide a smoother screws control and grant the telescope a premium quality touch. The fine tune service costs HK$400 (US$50). It's now waived for time-limited period.



Optical system Air-spaced triplets with 1 FPL-53 fluorite element
Aperture 71 mm
Focal length 419 mm
Focal ratio f/5.9
Image circle

> Full Frame

Back focus

54.8mm with Flat6A-II (adjustable)

Resolution 1.62 arcseconds
Limiting magnitude 11.1
Light gathering power 103x
OTA length

392 mm (contracted)
470 mm (fully extended)

Weight 2.95 kg

Free shipping applies

United States, S. Korea, Japan, Malaysia, Philippines, Singapore, Hong Kong, Taiwan, Indonesia, Australia, New Zealand, Germany, France, Switzerland, Sweden, Denmark, Netherlands, United Kingdoms and others.


7 days no question asked return if due to material or workmanship defects

2 years manufacturer's warranty from William Optics

Cyclops Optics Ltd. is an authorised dealer of William Optics' products.




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