William Optics Mighty-Cat 71 f/3.2 EVO Petzval Astrograph
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
- 7-Element EVO Petzval w/ Super ED glass. No need to calculate back focus
- Built-in Sensor Tilt Xterminator w/ Rotator
- Included M48 and M54 camera adapters
- Can support up to large full-frame camera sensors
- WIFD Rack & Pinion focuser - (EAF ready)
- Self-flattening design. No need for a separate field flattener
The Mighty-Cat 71 Astrograph: Fast Optics, Brilliant Results
The William Optics Mighty-Cat 71 is a 71 mm astrograph engineered to redefine ultra-fast deep-sky imaging. Featuring an f/3.2 focal ratio, the fastest telescope William Optics has ever created, it combines exceptional imaging speed with a generous 43.2 mm image circle and the patented WIFD (William Optics Internal Focus Design) focusing system.
The optical system dramatically reduces exposure times, making it easier to capture faint nebulae with remarkable detail in half the time. With advanced 7-element flat-field optics, precise internal focusing, and compatibility with both full-frame and cropped-sensor cameras, the Mighty-Cat 71 delivers exceptional performance in a compact, versatile design built for demanding astrophotography.
Please note: The video features the 30th Anniversary Edition. This standard version offers identical performance without the anniversary-specific cosmetic details.
Mighty-Cat 71 Standout Features
Built-In Bahtinov Mask
Integrated bahtinov mask into the front cap for quick and accurate focusing, making precise star focus easier in the field.
EAF-Ready
The Mighty-Cat focuser is compatible with Electronic Automatic Focusers (EAF) out of the box. Remove the temperature gauge knob and install the EAF with the appropriate mounting hardware for precise, automated focusing during astrophotography sessions.
Sensor Tilt Xterminator
Features a heavy-duty rear tilt and rotation interface designed to support modern imaging setups, reducing the chance of rear-end sag while retaining convenient sensor-squaring capability.
7-Element Petzval Optical Design
The Mighty-Cat 71 features a fast f/3.2 focal ratio and 230mm focal length, making it the fastest optical system in the company's history. Its 7-element Advanced Petzval layout incorporates two Super ED glass elements, two Lanthanum elements, and three specialized X-elements to eliminate chromatic aberration. This design inherently corrects for field curvature, providing a flat 43.2mm full-frame image circle that delivers pin-sharp stars across large camera sensors without requiring a separate external field flattener.
Versatile Mounting Hardware Included
Equipped with a sturdy mounting ring, convenient carrying handle, and a 210 mm dual-sided Vixen-style/Arca-Swiss dovetail plate for easy attachment to a variety of compatible telescope mounts and tripod systems. The top handle features an integrated mini Vixen-style mounting base for attaching compatible guide scopes and accessories, while additional M4 mounting holes on the ring and handle provide even more flexibility for customizing your imaging setup. With secure mounting hardware included, the Mighty-Cat 71 makes building and balancing your astrophotography rig easier than ever!
Patented WIFD Focuser
For heavy camera loads, the telescope utilizes the patented WIFD (William Optics Internal Focuser Design) rack-and-pinion system. Shifting lens elements internally over a 0–35mm range instead of extending an external drawtube removes focus flexure, prevents sensor tilt, and eliminates mechanical vignetting. The ready-to-image package includes an integrated Sensor Tilt Xterminator (STX-R), an M54/M48 camera adapter stack, a patented multi-use handlebar for accessories, and a dual-sided Vixen/Arca-Swiss dovetail plate, all packaged in a custom-fitted protective soft carrying case.
Specifications
-
Optical Design: 7-Element Advanced Petzval
-
Lens Elements:
-
2x Super ED
-
2x Lanthanum
-
3x Special X-Glass components
-
-
Focal Length: 230 mm
-
Aperture: 71 mm (2.8 in)
-
Focal Ratio: f/3.2
-
Image Circle: 43.2 mm (Full-frame)
-
Focuser: WIFD Internal Rack & Pinion
-
Focuser Travel: 0 mm to 35 mm (0 in to 1.38 in)
-
Optional Flattener: None required (Flat field is built directly into the 7-element Petzval design)
-
Camera Format Support: Full Frame, APS-C, and Micro 4/3 (M4/3)
-
T-Mount Support: Canon EF/RF, Nikon F/Z, Sony E, Pentax K, MFT (M4/3), and FUJI X
-
Dovetail Type: Reversible Vixen & Arca-Swiss
-
Optical Tube Length: 315 mm (12.4 in)
-
OTA Weight: 3.38 kg (7.45 lbs)
-
Total Weight: 4.1 kg (9.04 lbs) w/ included accessories
Diagram Reports
Wavelength Chart
Spot Diagram Chart
Other Information
- Country of Manufacture: Taiwan
The Mighty-Cat 71 Astrograph: Fast Optics, Brilliant Results
The William Optics Mighty-Cat 71 is a 71 mm astrograph engineered to redefine ultra-fast deep-sky imaging. Featuring an f/3.2 focal ratio, the fastest telescope William Optics has ever created, it combines exceptional imaging speed with a generous 43.2 mm image circle and the patented WIFD (William Optics Internal Focus Design) focusing system.
The optical system dramatically reduces exposure times, making it easier to capture faint nebulae with remarkable detail in half the time. With advanced 7-element flat-field optics, precise internal focusing, and compatibility with both full-frame and cropped-sensor cameras, the Mighty-Cat 71 delivers exceptional performance in a compact, versatile design built for demanding astrophotography.
Please note: The video features the 30th Anniversary Edition. This standard version offers identical performance without the anniversary-specific cosmetic details.
Mighty-Cat 71 Standout Features
Built-In Bahtinov Mask
Integrated bahtinov mask into the front cap for quick and accurate focusing, making precise star focus easier in the field.
EAF-Ready
The Mighty-Cat focuser is compatible with Electronic Automatic Focusers (EAF) out of the box. Remove the temperature gauge knob and install the EAF with the appropriate mounting hardware for precise, automated focusing during astrophotography sessions.
Sensor Tilt Xterminator
Features a heavy-duty rear tilt and rotation interface designed to support modern imaging setups, reducing the chance of rear-end sag while retaining convenient sensor-squaring capability.
7-Element Petzval Optical Design
The Mighty-Cat 71 features a fast f/3.2 focal ratio and 230mm focal length, making it the fastest optical system in the company's history. Its 7-element Advanced Petzval layout incorporates two Super ED glass elements, two Lanthanum elements, and three specialized X-elements to eliminate chromatic aberration. This design inherently corrects for field curvature, providing a flat 43.2mm full-frame image circle that delivers pin-sharp stars across large camera sensors without requiring a separate external field flattener.
Versatile Mounting Hardware Included
Equipped with a sturdy mounting ring, convenient carrying handle, and a 210 mm dual-sided Vixen-style/Arca-Swiss dovetail plate for easy attachment to a variety of compatible telescope mounts and tripod systems. The top handle features an integrated mini Vixen-style mounting base for attaching compatible guide scopes and accessories, while additional M4 mounting holes on the ring and handle provide even more flexibility for customizing your imaging setup. With secure mounting hardware included, the Mighty-Cat 71 makes building and balancing your astrophotography rig easier than ever!
Patented WIFD Focuser
For heavy camera loads, the telescope utilizes the patented WIFD (William Optics Internal Focuser Design) rack-and-pinion system. Shifting lens elements internally over a 0–35mm range instead of extending an external drawtube removes focus flexure, prevents sensor tilt, and eliminates mechanical vignetting. The ready-to-image package includes an integrated Sensor Tilt Xterminator (STX-R), an M54/M48 camera adapter stack, a patented multi-use handlebar for accessories, and a dual-sided Vixen/Arca-Swiss dovetail plate, all packaged in a custom-fitted protective soft carrying case.
Specifications
-
Optical Design: 7-Element Advanced Petzval
-
Lens Elements:
-
2x Super ED
-
2x Lanthanum
-
3x Special X-Glass components
-
-
Focal Length: 230 mm
-
Aperture: 71 mm (2.8 in)
-
Focal Ratio: f/3.2
-
Image Circle: 43.2 mm (Full-frame)
-
Focuser: WIFD Internal Rack & Pinion
-
Focuser Travel: 0 mm to 35 mm (0 in to 1.38 in)
-
Optional Flattener: None required (Flat field is built directly into the 7-element Petzval design)
-
Camera Format Support: Full Frame, APS-C, and Micro 4/3 (M4/3)
-
T-Mount Support: Canon EF/RF, Nikon F/Z, Sony E, Pentax K, MFT (M4/3), and FUJI X
-
Dovetail Type: Reversible Vixen & Arca-Swiss
-
Optical Tube Length: 315 mm (12.4 in)
-
OTA Weight: 3.38 kg (7.45 lbs)
-
Total Weight: 4.1 kg (9.04 lbs) w/ included accessories
Diagram Reports
Wavelength Chart
Spot Diagram Chart
| Manufacturer | William Optics |
|---|---|
| Telescope Focal Length | Up to 300mm |
- 1x Mighty-Cat Astrograph
- 1x Sensor Tilt Xterminator (STX-R) Rotator
- 1x Bahtinov Mask/ Front Cap
- 1x M48 Camera Adapter
- 1x M54 Camera Adapter
- 1x Dual-Side Dovetail Plate
- 1x Mounting Ring & Handle Bar
- 1x Allen Key Set
- 7-Element EVO Petzval w/ Super ED glass. No need to calculate back focus
- Built-in Sensor Tilt Xterminator w/ Rotator
- Included M48 and M54 camera adapters
- Can support up to large full-frame camera sensors
- WIFD Rack & Pinion focuser - (EAF ready)
- Self-flattening design. No need for a separate field flattener
The Mighty-Cat 71 Astrograph: Fast Optics, Brilliant Results
The William Optics Mighty-Cat 71 is a 71 mm astrograph engineered to redefine ultra-fast deep-sky imaging. Featuring an f/3.2 focal ratio, the fastest telescope William Optics has ever created, it combines exceptional imaging speed with a generous 43.2 mm image circle and the patented WIFD (William Optics Internal Focus Design) focusing system.
The optical system dramatically reduces exposure times, making it easier to capture faint nebulae with remarkable detail in half the time. With advanced 7-element flat-field optics, precise internal focusing, and compatibility with both full-frame and cropped-sensor cameras, the Mighty-Cat 71 delivers exceptional performance in a compact, versatile design built for demanding astrophotography.
Please note: The video features the 30th Anniversary Edition. This standard version offers identical performance without the anniversary-specific cosmetic details.
Mighty-Cat 71 Standout Features
Built-In Bahtinov Mask
Integrated bahtinov mask into the front cap for quick and accurate focusing, making precise star focus easier in the field.
EAF-Ready
The Mighty-Cat focuser is compatible with Electronic Automatic Focusers (EAF) out of the box. Remove the temperature gauge knob and install the EAF with the appropriate mounting hardware for precise, automated focusing during astrophotography sessions.
Sensor Tilt Xterminator
Features a heavy-duty rear tilt and rotation interface designed to support modern imaging setups, reducing the chance of rear-end sag while retaining convenient sensor-squaring capability.
7-Element Petzval Optical Design
The Mighty-Cat 71 features a fast f/3.2 focal ratio and 230mm focal length, making it the fastest optical system in the company's history. Its 7-element Advanced Petzval layout incorporates two Super ED glass elements, two Lanthanum elements, and three specialized X-elements to eliminate chromatic aberration. This design inherently corrects for field curvature, providing a flat 43.2mm full-frame image circle that delivers pin-sharp stars across large camera sensors without requiring a separate external field flattener.
Versatile Mounting Hardware Included
Equipped with a sturdy mounting ring, convenient carrying handle, and a 210 mm dual-sided Vixen-style/Arca-Swiss dovetail plate for easy attachment to a variety of compatible telescope mounts and tripod systems. The top handle features an integrated mini Vixen-style mounting base for attaching compatible guide scopes and accessories, while additional M4 mounting holes on the ring and handle provide even more flexibility for customizing your imaging setup. With secure mounting hardware included, the Mighty-Cat 71 makes building and balancing your astrophotography rig easier than ever!
Patented WIFD Focuser
For heavy camera loads, the telescope utilizes the patented WIFD (William Optics Internal Focuser Design) rack-and-pinion system. Shifting lens elements internally over a 0–35mm range instead of extending an external drawtube removes focus flexure, prevents sensor tilt, and eliminates mechanical vignetting. The ready-to-image package includes an integrated Sensor Tilt Xterminator (STX-R), an M54/M48 camera adapter stack, a patented multi-use handlebar for accessories, and a dual-sided Vixen/Arca-Swiss dovetail plate, all packaged in a custom-fitted protective soft carrying case.
Specifications
-
Optical Design: 7-Element Advanced Petzval
-
Lens Elements:
-
2x Super ED
-
2x Lanthanum
-
3x Special X-Glass components
-
-
Focal Length: 230 mm
-
Aperture: 71 mm (2.8 in)
-
Focal Ratio: f/3.2
-
Image Circle: 43.2 mm (Full-frame)
-
Focuser: WIFD Internal Rack & Pinion
-
Focuser Travel: 0 mm to 35 mm (0 in to 1.38 in)
-
Optional Flattener: None required (Flat field is built directly into the 7-element Petzval design)
-
Camera Format Support: Full Frame, APS-C, and Micro 4/3 (M4/3)
-
T-Mount Support: Canon EF/RF, Nikon F/Z, Sony E, Pentax K, MFT (M4/3), and FUJI X
-
Dovetail Type: Reversible Vixen & Arca-Swiss
-
Optical Tube Length: 315 mm (12.4 in)
-
OTA Weight: 3.38 kg (7.45 lbs)
-
Total Weight: 4.1 kg (9.04 lbs) w/ included accessories
Diagram Reports
Wavelength Chart
Spot Diagram Chart
Other Information
- Country of Manufacture: Taiwan
| Manufacturer | William Optics |
|---|---|
| Telescope Focal Length | Up to 300mm |
- 1x Mighty-Cat Astrograph
- 1x Sensor Tilt Xterminator (STX-R) Rotator
- 1x Bahtinov Mask/ Front Cap
- 1x M48 Camera Adapter
- 1x M54 Camera Adapter
- 1x Dual-Side Dovetail Plate
- 1x Mounting Ring & Handle Bar
- 1x Allen Key Set