William Optics GT81 81mm f/5.9 Blue Apo Refractor - Limited Edition
This item is discontinued by the manufacturer and is no longer available.
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Special Offer: Receive $10 off a Soft Carry Case for this telescope. Just add both items to your cart and the discount will be automatically applied. Offer valid ONLY if you purchase both items (Case and GT81 Scope) in the same transaction.
Limited Edition BLUE GT81 - Only 20 sets offered worldwide. [Aug 1 Update] We just snagged the last 2 remaining pcs from WO. This is your final opportunity to get one of these beauties!
Package Includes:
- GT81 Triplet Apo Refractor OTA
- Finder/Guiding rings
- 2" R&P focuser with 2 speed knobs (1:10) focuser and built-in temperature gauge
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 blue 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.
Patented Design
- Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
- Graduated scale for precise camera alignment.
Simply Beautiful Finish
- Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, blue 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.
- Carry handle with V-shape night glowing illuminator.
- 2 Year warranty from William Optics.
Limited Edition BLUE GT81 - Only 20 sets offered worldwide. [Aug 1 Update] We just snagged the last 2 remaining pcs from WO. This is your final opportunity to get one of these beauties!
Package Includes:
- GT81 Triplet Apo Refractor OTA
- Finder/Guiding rings
- 2" R&P focuser with 2 speed knobs (1:10) focuser and built-in temperature gauge
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 blue 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.
Patented Design
- Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
- Graduated scale for precise camera alignment.
Simply Beautiful Finish
- Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, blue 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.
- Carry handle with V-shape night glowing illuminator.
- 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) |
Special Offer: Receive $10 off a Soft Carry Case for this telescope. Just add both items to your cart and the discount will be automatically applied. Offer valid ONLY if you purchase both items (Case and GT81 Scope) in the same transaction.
Limited Edition BLUE GT81 - Only 20 sets offered worldwide. [Aug 1 Update] We just snagged the last 2 remaining pcs from WO. This is your final opportunity to get one of these beauties!
Package Includes:
- GT81 Triplet Apo Refractor OTA
- Finder/Guiding rings
- 2" R&P focuser with 2 speed knobs (1:10) focuser and built-in temperature gauge
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 blue 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.
Patented Design
- Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
- Graduated scale for precise camera alignment.
Simply Beautiful Finish
- Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, blue 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.
- Carry handle with V-shape night glowing illuminator.
- 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) |