William Optics ZenithStar 80mm f/6.8 II ED APO Refractor
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The newest ZenithStar II generation Doublet APO is an 80mm ED refractor ideal for everyone who needs an excellent back-up scope/ guiding scope at an excellent price, or a great first APO refractor that you can use for planetary work, wide-field imaging, and crisp, high power observations.
This is an air spaced f/6.8 refractor with 1:10 microfocuser and aluminum case included in the price. The scope boasts premium Japanese Ohara FPL-51 ED glass and Fully Multi-Coatings for an excellent sharpness and color correction.
Lens Design
- Doublet ED, using premium Ohara FPL-51 Japanese glass, air spaced, in CNC machined ultra high precision lens cell.
- Each lens is Fully Multi-Coated with best in class anti-reflective coatings.
Low CA
- Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast.
- 80 mm clear aperture.
Nothing Left to Chance
- Fully CNC machined production, no plastic parts used.
- Drawtube travel length 80 mm, with precision graduated scale.
- 1.25in adapter included.
- Brass Compression rings on the adapter: will not ruin your precious eyepieces!
Super Portable
- Retractable dewshield for enhanced transportability.
- Only 6.2 lbs. Perfect for piggybacking as guide scope.
- Optional rings, guiding rings and 0.8x field flattener/reducer are available!
Beautiful Anodizing
- Superior anodizing will not only give you a beautiful telescope, but will also protect it by making the surface much harder than natural aluminum.
- The elegant finish is stylish like a designer product! The blue OTA is particularly suited to be paired with SCTs as a guiding scope.
Wonderful WO Microfocuser
- William Optics 360-degree rotatable smooth and precise Crayford focuser.
- Adjustable focuser tension.
- Super-smooth and reliable 1:10 micro focuser for fine focusing during astrophotography or visual observations alike.
Attention to Packaging
- Exclusive Aluminum carrying case included in the price.
- Water resistant case.
- Carry-on size: you do not have to leave your treasure home!
- Two-year, no fuss warranty and constant customer service!
Useful Resources
-Manual: Zenith Star 80mm Telescope Manual (PDF Format) - Chromatic Aberration Graph - Spot Diagram
The newest ZenithStar II generation Doublet APO is an 80mm ED refractor ideal for everyone who needs an excellent back-up scope/ guiding scope at an excellent price, or a great first APO refractor that you can use for planetary work, wide-field imaging, and crisp, high power observations.
This is an air spaced f/6.8 refractor with 1:10 microfocuser and aluminum case included in the price. The scope boasts premium Japanese Ohara FPL-51 ED glass and Fully Multi-Coatings for an excellent sharpness and color correction.
Lens Design
- Doublet ED, using premium Ohara FPL-51 Japanese glass, air spaced, in CNC machined ultra high precision lens cell.
- Each lens is Fully Multi-Coated with best in class anti-reflective coatings.
Low CA
- Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast.
- 80 mm clear aperture.
Nothing Left to Chance
- Fully CNC machined production, no plastic parts used.
- Drawtube travel length 80 mm, with precision graduated scale.
- 1.25in adapter included.
- Brass Compression rings on the adapter: will not ruin your precious eyepieces!
Super Portable
- Retractable dewshield for enhanced transportability.
- Only 6.2 lbs. Perfect for piggybacking as guide scope.
- Optional rings, guiding rings and 0.8x field flattener/reducer are available!
Beautiful Anodizing
- Superior anodizing will not only give you a beautiful telescope, but will also protect it by making the surface much harder than natural aluminum.
- The elegant finish is stylish like a designer product! The blue OTA is particularly suited to be paired with SCTs as a guiding scope.
Wonderful WO Microfocuser
- William Optics 360-degree rotatable smooth and precise Crayford focuser.
- Adjustable focuser tension.
- Super-smooth and reliable 1:10 micro focuser for fine focusing during astrophotography or visual observations alike.
Attention to Packaging
- Exclusive Aluminum carrying case included in the price.
- Water resistant case.
- Carry-on size: you do not have to leave your treasure home!
- Two-year, no fuss warranty and constant customer service!
| Manufacturer | William Optics |
|---|
| Aperture | 80mm |
| Focal Ratio | F/6.8 |
| Focal Length | 545mm |
| Objective Type | FPL-51 ED Glass, Doublet, Air Spaced APO, Fully Multi-Coated |
| Resolving Power | 1.45" |
| Limiting Magnitude | 11.3 |
| Lens Shade | Retractable |
| Focuser | 2in 360° Rotating Camera-angle Adjuster 1:10 fine focus Focuser Travel Length 3.15in (80mm) 1.25in Adapter Included |
| 1.25" Adapter | Brass Compression Rings |
| L- type Mount | L-Bracket Base |
| Field Stops | 10 Baffles |
| Tube Diameter | 90mm |
| Tube Length | 16.9in (430mm) Fully Retracted 19.7in (500mm) Fully Extended |
| Tube Weight | 6.2 lbs (2.8 kg) |
| Case | Aluminium Case (Standard) |
| Case Dimensions (WxHxD) | 22.4in x 12.6in x 8.3in (57cm x 32cm x 21cm) (Water Resistant) |
The newest ZenithStar II generation Doublet APO is an 80mm ED refractor ideal for everyone who needs an excellent back-up scope/ guiding scope at an excellent price, or a great first APO refractor that you can use for planetary work, wide-field imaging, and crisp, high power observations.
This is an air spaced f/6.8 refractor with 1:10 microfocuser and aluminum case included in the price. The scope boasts premium Japanese Ohara FPL-51 ED glass and Fully Multi-Coatings for an excellent sharpness and color correction.
Lens Design
- Doublet ED, using premium Ohara FPL-51 Japanese glass, air spaced, in CNC machined ultra high precision lens cell.
- Each lens is Fully Multi-Coated with best in class anti-reflective coatings.
Low CA
- Fully baffled to block all extraneous off-axis light rays and prevent glancing reflections, increasing overall contrast.
- 80 mm clear aperture.
Nothing Left to Chance
- Fully CNC machined production, no plastic parts used.
- Drawtube travel length 80 mm, with precision graduated scale.
- 1.25in adapter included.
- Brass Compression rings on the adapter: will not ruin your precious eyepieces!
Super Portable
- Retractable dewshield for enhanced transportability.
- Only 6.2 lbs. Perfect for piggybacking as guide scope.
- Optional rings, guiding rings and 0.8x field flattener/reducer are available!
Beautiful Anodizing
- Superior anodizing will not only give you a beautiful telescope, but will also protect it by making the surface much harder than natural aluminum.
- The elegant finish is stylish like a designer product! The blue OTA is particularly suited to be paired with SCTs as a guiding scope.
Wonderful WO Microfocuser
- William Optics 360-degree rotatable smooth and precise Crayford focuser.
- Adjustable focuser tension.
- Super-smooth and reliable 1:10 micro focuser for fine focusing during astrophotography or visual observations alike.
Attention to Packaging
- Exclusive Aluminum carrying case included in the price.
- Water resistant case.
- Carry-on size: you do not have to leave your treasure home!
- Two-year, no fuss warranty and constant customer service!
Useful Resources
-Manual: Zenith Star 80mm Telescope Manual (PDF Format) - Chromatic Aberration Graph - Spot Diagram
| Manufacturer | William Optics |
|---|
| Aperture | 80mm |
| Focal Ratio | F/6.8 |
| Focal Length | 545mm |
| Objective Type | FPL-51 ED Glass, Doublet, Air Spaced APO, Fully Multi-Coated |
| Resolving Power | 1.45" |
| Limiting Magnitude | 11.3 |
| Lens Shade | Retractable |
| Focuser | 2in 360° Rotating Camera-angle Adjuster 1:10 fine focus Focuser Travel Length 3.15in (80mm) 1.25in Adapter Included |
| 1.25" Adapter | Brass Compression Rings |
| L- type Mount | L-Bracket Base |
| Field Stops | 10 Baffles |
| Tube Diameter | 90mm |
| Tube Length | 16.9in (430mm) Fully Retracted 19.7in (500mm) Fully Extended |
| Tube Weight | 6.2 lbs (2.8 kg) |
| Case | Aluminium Case (Standard) |
| Case Dimensions (WxHxD) | 22.4in x 12.6in x 8.3in (57cm x 32cm x 21cm) (Water Resistant) |