William Optics All New 0.8x Reducer / Adjustable Field Flattener 6AIII for GT71, GT81, Z81 & Z103 Telescopes - Space Gray
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Please note: As of late-September, this item now comes in black with a gray trim only as pictured. It is no longer offered in a gold trim as before. Other than the color, the two versions are identical.
All New 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.
Compatibility
- Gran Turismo 71
- Adjust Distance: 9.1mm
- Back Focus: 64.1mm
- Image Circle: ∅44.4mm
- Gran Turismo 81
- Adjust Distance: 7.1mm
- Back Focus: 62.1mm
- Image Circle: ∅44.4mm
- Zenithstar 81
- Adjust Distance: 5.2mm
- Back Focus: 60.2mm
- Image Circle: ∅44.3mm
- Zenithstar 103
- Adjust Distance: 2.5mm
- Back Focus: 57.5mm
- Image Circle: ∅43.1mm
- Fluorostar 91 + Front Adapter
- Adjust Distance: 5.4mm
- Back Focus: 60.4mm
- Image Circle: ∅44.4mm
Specifcations
- Lens Type: 3 Groups 3 Elements
- Length: 61.5 mm
- Telescope Thread: M63 x 1 x 6 mm
- T-mount Thread: M48 x 0.75 x 4 mm
- T-mount Supported: Canon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4/3); FUJI X
- Camera Format; > Full Frame
- Weight: 519.4 g / 1.1 lbs
Other Information
- Country of Manufacture: Taiwan
Please note: As of late-September, this item now comes in black with a gray trim only as pictured. It is no longer offered in a gold trim as before. Other than the color, the two versions are identical.
All New 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.
Compatibility
- Gran Turismo 71
- Adjust Distance: 9.1mm
- Back Focus: 64.1mm
- Image Circle: ∅44.4mm
- Gran Turismo 81
- Adjust Distance: 7.1mm
- Back Focus: 62.1mm
- Image Circle: ∅44.4mm
- Zenithstar 81
- Adjust Distance: 5.2mm
- Back Focus: 60.2mm
- Image Circle: ∅44.3mm
- Zenithstar 103
- Adjust Distance: 2.5mm
- Back Focus: 57.5mm
- Image Circle: ∅43.1mm
- Fluorostar 91 + Front Adapter
- Adjust Distance: 5.4mm
- Back Focus: 60.4mm
- Image Circle: ∅44.4mm
Specifcations
- Lens Type: 3 Groups 3 Elements
- Length: 61.5 mm
- Telescope Thread: M63 x 1 x 6 mm
- T-mount Thread: M48 x 0.75 x 4 mm
- T-mount Supported: Canon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4/3); FUJI X
- Camera Format; > Full Frame
- Weight: 519.4 g / 1.1 lbs
Please note: As of late-September, this item now comes in black with a gray trim only as pictured. It is no longer offered in a gold trim as before. Other than the color, the two versions are identical.
All New 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.
Compatibility
- Gran Turismo 71
- Adjust Distance: 9.1mm
- Back Focus: 64.1mm
- Image Circle: ∅44.4mm
- Gran Turismo 81
- Adjust Distance: 7.1mm
- Back Focus: 62.1mm
- Image Circle: ∅44.4mm
- Zenithstar 81
- Adjust Distance: 5.2mm
- Back Focus: 60.2mm
- Image Circle: ∅44.3mm
- Zenithstar 103
- Adjust Distance: 2.5mm
- Back Focus: 57.5mm
- Image Circle: ∅43.1mm
- Fluorostar 91 + Front Adapter
- Adjust Distance: 5.4mm
- Back Focus: 60.4mm
- Image Circle: ∅44.4mm
Specifcations
- Lens Type: 3 Groups 3 Elements
- Length: 61.5 mm
- Telescope Thread: M63 x 1 x 6 mm
- T-mount Thread: M48 x 0.75 x 4 mm
- T-mount Supported: Canon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4/3); FUJI X
- Camera Format; > Full Frame
- Weight: 519.4 g / 1.1 lbs
Other Information
- Country of Manufacture: Taiwan
William Optics All New 0.8x Reducer / Adjustable Field Flattener 6AIII for GT71, GT81, Z81 & Z103 Telescopes - Space Gray