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William Optics GTF102 102mm f/7.7 Apo Refractor with Built-In Flattener # A-F102GTA

5.0 (1 Reviews) Read Reviews Write Review
Brand William Optics
Part Number A-F102GTA

Product Info

Manufacturer Description

The new 2013 GTF 102 five-element super apo from William Optics has arrived! Superb quality for imaging and visual at an affordable price.

The package includes:

  • GTF 102 built-in five element design with FPL-53 and other ED element glass
  • Flat field (covers full frame image circle)
  • Mounting rings
  • Retractable dew shield
  • All-new 2.5" R&P focuser design with 360-degree rotatable focuser (no image shift)
  • 2 speed knobs 1:10 
  • Aperture: 102mm f/7.68
  • Free Vixen/Synta-style dovetail plate
  • Weight: 11 lb; length: 27"

The stunning new William Optics GTF 102 APO is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC to the elegant red trim, this beauty has more than just good looks. The new GTF 102 features a 5-element objective using high-quality FPL-53 glass and combined with other extra-low dispersion glass that provides a perfectly flat field and reduces any secondary spectrum to an unbelievable degree.

Optically Unbeatable

  • Five element air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
  • Three-elment primary objective with two-element built-in field flattener.
  • 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/7.68 flat field telescope is ideal for astrophotography.

Simply Beautiful Finish

  • Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, red finish,
  • Retractable dewshield and dewshield cap.
  • 360-deg rotatable all-new R&P focuser.
  • 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.
  • Mounting rings are included.
  • 2-year warranty from William Optics.


5.0 (Based on 1 Reviews) 100% of reviewers recommended this product.
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    1. Guest

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      User Notes:
      Review by MAW of Fredericksburg, TX.
      Nov 1, 2013

      5.0 Extremely nice telescope!


      Strong Construction,Easy to Use,Accurate,Quality Lenses



      The optics of the 5 element GTF102 exhibit no discernable color, in or out of focus, even when viewing bright stars such as Vega. The built-in flattener easily covers my APS sized CCD camera with perfect stars. The focuser is smooth and stout, with all the adjustments necessary to keep it that way (mine had loosened somewhat in transit). The tube is well made and heavy for its size. Visually it is on par with a friend's very high-end 4" APO. Can't say enough about the quality of this scope. An amazing deal at this price.

      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 4.02" (102mm)
      Manufacturer William Optics
      Telescope Aperture 81mm - 125mm
      Telescope Series William Optics GT