William Optics Mighty Cat 71 WIFD f/3.2 Full Frame (30th Anniversary Limited Edition)

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The William Optics Mighty Cat 71 · 30 Years Anniversary Limited Edition is a groundbreaking 71mm apochromatic astrograph engineered to redefine ultra-fast deep-sky imaging. Celebrating three decades of optical innovation, this exclusive 100-set limited run features a custom "Cosmic Visitor" design adorned with intricate extraterrestrial motifs — a tribute to 30 years of peering into the unknown and chasing the mysteries of the universe. It introduces an unprecedented, record-breaking f/3.2 focal ratio—the fastest telescope William Optics has ever created—while featuring a 43.2mm image circle and the patented WIFD internal focusing system.

The ultra-fast f/3.2 optical system drastically reduces required exposure times, helping capture faint nebulae, dark dust lanes, and expansive celestial structures in a fraction of the time. With its flat-field 7-element optics, stable internal focusing, and a playful design that hints at technology from another world, the Mighty Cat 71 Anniversary Edition is built for demanding deep-sky imaging with modern full-frame and cropped-sensor camera systems.

Highlights of the Mighty Cat 71 WIFD F/3.2 30th Anniversary Limited Edition

• 7 elements Advanced Petzval flat field design
• Super ED Glass x2, Lanthanum Glass x2, X-Element x3
• WO Internal Focus Design (WIFD), compatible with motorised focuser
• Extremely fast focal ratio f/3.2
• Full frame format coverage (43.2mm)
• Anti-Shrink Lens Cell Technology
• Sensor Tilt eXterminator (STX)
• Interchangeable camera mount (Canon EF, RF / Nikon F,Z / Sony E / Pentax K / M4/3 / Fujifilm X)
• Compatible with any 48mm (2") imaging filter
• Super bright Bahtinov mask + lens cap
• Field rotator 
• 4.1kg only including mounting base (OTA only 3.38kg)

Exclusive features of the Mighty Cat 71 WIFD F/3.2 APO:

• F/3.2 Advanced Petzval Design
• Sensor Tilt Corrector (STX)
• Full frame format coverage
• WO patented innovative internal focus design (WIFD)

Package Includes:

1. Mighty Cat 71 APO WIFD 30th Anniversary Limited Edition
2. WO lens cap with bahtinov Mask 
3. Mounting rings with Saddle Handle Bar
4. Camera Angle Rotator
5. Sensor Tilt eXterminator (STX)
6. Vixen Style Dovetail Plat
7. M48 and M54 adapters
8. Soft carrying case
9. Allen key set 

Optical Diagrams

Spot Diagram

William Optics Mighty-Cat 71 Specifications