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

Our Price: $1,028.00
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Out of Stock
Availability: Item has been discontinued and is no longer available.
Our Product ID: ZZT-ZZWO-GT81-DDG
Manufacturer SKU: A-F81GT-DDG
Item Can Ship: Worldwide
William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG

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  • William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG
  • William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG
  • William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG
  • William Optics GT81 81mm f/5.9 Apo Refractor with DDG Focuser - Gold # A-F81GT-DDG

Availability: Item has been discontinued and is no longer available.

Product Details

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 DDG Focuser

  • The Digital Display Gauge - DDG - allows you to take precise focusing readings down to two decimals precision instantly.
  • 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
Manufacturer William Optics
Aperture 81 mm
Focal Ratio F/5.9
Focal Length 478 mm
Objective Type Three element with FPL-53 Air Spaced, Fully Multi-Coated, STM coatings
Resolving Power 1.43"
Limiting Magnitude 12.2
Lens Shade Retractable
R&P Focuser 2" 360° Rotating Camera-angle Adjuster
1:10 fine focus
1.25" Adapter
L-type Mount L Bracket
Field Stops Knife-Edge Baffles
Tube Diameter 90mm
Tube Length 440mm Fully Retracted
484mm Fully Extended
Tube Weight 8.1 lbs. (3.7 kg)

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