William Optics GT71 71mm f/5.9 Apo Refractor (Red) - Astrophotography Package (OTA, Field Flattener, Guidescope)
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New for 2023 - William Optics now includes a free M-CAA63 rotator with this telescope (a $109 value)!
Gran Turismo 71 APO Refractor Telescope
The stunning new William Optics Gran Turismo 71 Apo is the new jewel of the apochromatic refractor world. The new GT71 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.
2.5" R&P Focuser
- Extra-smooth 2.5" 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
- Quality fit and finish: powder-painted white CNC-machined aluminum tube, red trim finish, retractable dewshield, dewshield cap.
- Top quality anodizing.
- Very compact for carrying on flights.
Astrophotography Package：
- CNC Carry Handle/Saddle Bar with integrated VIxen-style slot for compatible guidescopes or finder brackets
- New Dual-Sided Dovetail Rail
- 2.5” R&P Focuser
- Innovative Bahtinov Mask Cover (Patented)
- Soft Carry Case
- Flat6AIII flattener
- Two-year, no fuss warranty and constant customer service!
Optional Accessories：
- M63 -2” Rotolock
- 1.25” Rotolock
- All New Slide-base 50mm Guiding Rings
- Slide-base UniGuide 32mm or 50mm Scope
Specifications:
- Focal Length: 419mm
- Diameter: 71mm
- Aperture: f/5.9
- Camera Format: APS-C, Full Frame
- Focuser: 2.5" R&P Focuser
- Image Circle: > Full Frame
- Flattener: Flat6AIII
- Tube Length (Fully Retracted): 392mm
- Tube Length (Fully Extended): 470mm
- Dew shield OD: 92mm / 3.62"
- Tube Weight: 2.95 kg
- Interchangeable T-Mount (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji FX
Adjustable Flat6AIII (T-mount not included)
This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6AIII will provide good illumination and flat field across 97% of full frame sized sensors.
Full frame size
- Designed with nearly Full frame chip-size DSLR cameras in mind.
- FMC triplet APO design.
- Produced entirely with the best Ohara optical glasses.
Amazing
- Reducing factor 0.8X.
- Adjustable design, for perfect back focus it can be used with other models of refractor
- 48mm filter ready
Superb Finish
- William Optics polished anodized finish.
- All internal surfaces threaded and blackened to prevent reflections.
Easy to Use
- Will accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.
Adjustment Distance
- GT71: 7.1mm
Other Information
- Country of Manufacture: Taiwan
New for 2023 - William Optics now includes a free M-CAA63 rotator with this telescope (a $109 value)!
Gran Turismo 71 APO Refractor Telescope
The stunning new William Optics Gran Turismo 71 Apo is the new jewel of the apochromatic refractor world. The new GT71 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.
2.5" R&P Focuser
- Extra-smooth 2.5" 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
- Quality fit and finish: powder-painted white CNC-machined aluminum tube, red trim finish, retractable dewshield, dewshield cap.
- Top quality anodizing.
- Very compact for carrying on flights.
Astrophotography Package：
- CNC Carry Handle/Saddle Bar with integrated VIxen-style slot for compatible guidescopes or finder brackets
- New Dual-Sided Dovetail Rail
- 2.5” R&P Focuser
- Innovative Bahtinov Mask Cover (Patented)
- Soft Carry Case
- Flat6AIII flattener
- Two-year, no fuss warranty and constant customer service!
Optional Accessories：
- M63 -2” Rotolock
- 1.25” Rotolock
- All New Slide-base 50mm Guiding Rings
- Slide-base UniGuide 32mm or 50mm Scope
Specifications:
- Focal Length: 419mm
- Diameter: 71mm
- Aperture: f/5.9
- Camera Format: APS-C, Full Frame
- Focuser: 2.5" R&P Focuser
- Image Circle: > Full Frame
- Flattener: Flat6AIII
- Tube Length (Fully Retracted): 392mm
- Tube Length (Fully Extended): 470mm
- Dew shield OD: 92mm / 3.62"
- Tube Weight: 2.95 kg
- Interchangeable T-Mount (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji FX
Adjustable Flat6AIII (T-mount not included)
This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6AIII will provide good illumination and flat field across 97% of full frame sized sensors.
Full frame size
- Designed with nearly Full frame chip-size DSLR cameras in mind.
- FMC triplet APO design.
- Produced entirely with the best Ohara optical glasses.
Amazing
- Reducing factor 0.8X.
- Adjustable design, for perfect back focus it can be used with other models of refractor
- 48mm filter ready
Superb Finish
- William Optics polished anodized finish.
- All internal surfaces threaded and blackened to prevent reflections.
Easy to Use
- Will accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.
Adjustment Distance
- GT71: 7.1mm
New for 2023 - William Optics now includes a free M-CAA63 rotator with this telescope (a $109 value)!
Gran Turismo 71 APO Refractor Telescope
The stunning new William Optics Gran Turismo 71 Apo is the new jewel of the apochromatic refractor world. The new GT71 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.
2.5" R&P Focuser
- Extra-smooth 2.5" 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
- Quality fit and finish: powder-painted white CNC-machined aluminum tube, red trim finish, retractable dewshield, dewshield cap.
- Top quality anodizing.
- Very compact for carrying on flights.
Astrophotography Package：
- CNC Carry Handle/Saddle Bar with integrated VIxen-style slot for compatible guidescopes or finder brackets
- New Dual-Sided Dovetail Rail
- 2.5” R&P Focuser
- Innovative Bahtinov Mask Cover (Patented)
- Soft Carry Case
- Flat6AIII flattener
- Two-year, no fuss warranty and constant customer service!
Optional Accessories：
- M63 -2” Rotolock
- 1.25” Rotolock
- All New Slide-base 50mm Guiding Rings
- Slide-base UniGuide 32mm or 50mm Scope
Specifications:
- Focal Length: 419mm
- Diameter: 71mm
- Aperture: f/5.9
- Camera Format: APS-C, Full Frame
- Focuser: 2.5" R&P Focuser
- Image Circle: > Full Frame
- Flattener: Flat6AIII
- Tube Length (Fully Retracted): 392mm
- Tube Length (Fully Extended): 470mm
- Dew shield OD: 92mm / 3.62"
- Tube Weight: 2.95 kg
- Interchangeable T-Mount (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji FX
Adjustable Flat6AIII (T-mount not included)
This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. WO Flat 6AIII will provide good illumination and flat field across 97% of full frame sized sensors.
Full frame size
- Designed with nearly Full frame chip-size DSLR cameras in mind.
- FMC triplet APO design.
- Produced entirely with the best Ohara optical glasses.
Amazing
- Reducing factor 0.8X.
- Adjustable design, for perfect back focus it can be used with other models of refractor
- 48mm filter ready
Superb Finish
- William Optics polished anodized finish.
- All internal surfaces threaded and blackened to prevent reflections.
Easy to Use
- Will accept any standard 48mm wide T-ring for your camera. Not compatible with smaller 42mm T rings.
Adjustment Distance
- GT71: 7.1mm
Other Information
- Country of Manufacture: Taiwan