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William Optics GT81 81mm f/5.9 Apo Refractor - Gold # A-F81GT

4.0 (1 Reviews) Read Reviews Write Review
Brand William Optics
Part Number A-F81GT
Availability available

Product Info

Manufacturer Description

The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC tube to the elegant gold trim, this telescope has more than just good looks. The new GT81 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree.

Optically Unbeatable

  • Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
  • Extremely sharp with excellent color correction.
  • Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
  • This f/5.9 lens is ideal for astrophotography.

2” R&P Focuser

  • Extra-smooth 360 deg. rotatable 2" R&P focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting!
  • Comes with two locking screws on angled positions for heavy load applications.
  • Large aluminum knob with installed thermometer.
  • Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
  • Graduated scale for precise camera alignment on focuser tube

Patented Design

  • Top mounted 50mm finder bracket.
  • L-bracket Vixen/Synta-style dovetail base.

Simply Beautiful Finish

  • Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, dewshield cap.
  • Top quality anodizing.
  • Very compact for carrying on flights.

Attention to Details

  • 2" & 1.25" adapter included in the price.
  • Anti-marring brass compression rings.
  • 2 year warranty from William Optics


4.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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      User Notes:
      Review by Mark of Cottleville, MO.
      Jan 31, 2014

      4.0 Good photo scope


      Strong Construction,Compact


      Difficult To Focus


      I have only used the scope for a short time so far, so my experience with it is limited. Also, I use a modest price reducer/flattener so I won't dwell on optical performance which is at least very good. The scope is extremely solid and well built. I purchased the GT81 for deep sky AP only so that may influence my opinions. One limitation the scope has is in focusing. To reach focus using any of my eyepieces, I needed to add a 2" extender and have the focuser nearly all the way out. I was concerned that such a sturdy scope would be somewhat compromised by having to rely on the focuser so far out and using extenders. But for AP, I don't need the extender and deflection doesn't seem to be a problem so far. I believe WO was attempting to keep the overall size down for portability. As for the focuser itself, it is not as smooth as one might expect. But it will hold high loads. That was another reason for my choosing this scope. My camera, filter wheel and reducer weigh about 2 lb, and this scope can hold them all night without even tightening down the focus lock. All in all, an excellent scope for AP if one recognizes the associated limitations.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Telescope Aperture 3.19" (81mm)
      Manufacturer William Optics
      Telescope Aperture 81mm - 125mm
      Telescope Series William Optics GT