Celebrating Three Decades of Excellence: The Ultra-Cat 76 Anniversary Edition
A Milestone Worth Celebrating
The Cat series has always marked turning points in William Optics’ journey. In 2019, the introduction of the RedCat 51 revolutionized the refractor market—its lightweight, portable, and high-quality design became an instant favorite among amateurs worldwide. To this day, the RedCat 51 remains our best-selling refractor of all time, with countless astrophotographers proudly calling it their first serious telescope.
In 2024, we unveiled the WIFD focuser system, a structural innovation that opened a new chapter for our brand. Then in 2025, we pushed optical design even further with the advanced 5-element Petzval, launching the Ultra-Cat series. With unmatched pinpoint star performance, the Ultra-Cat refractors quickly became some of the most discussed instruments in global astronomy communities. The larger 91mm and 108mm models set a new standard for wide-field astrophotography and sold with remarkable success.
Now, as we celebrate our 30th Anniversary, we proudly introduce the Ultra-Cat 76 as the commemorative edition. With its moderate size, balanced portability, and accessible pricing, the 76 is poised to become the most popular member of the Ultra-Cat family—just as the RedCat 51 once did for the original Cat line.
Anniversary Highlights
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Limited to 100 Units – Each telescope is individually numbered, affirming its rarity as a commemorative edition.
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Symbolic Laser Engraving – A special design featuring a cat embracing the number “30,” honoring the legacy of the Cat series.
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Commemorative Certificate – Every unit is accompanied by an official 30th Anniversary certificate.
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Exclusive Accessory – Includes a complimentary UniGuide 32mm guide scope to complete your anniversary edition set.
- Legacy & Future – Celebrates 30 years of William Optics, linking the success of the Cat series to a new era of Ultra-Cat innovation.
Optical & Mechanical Excellence
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76mm Aperture, f/4.8 Advanced Petzval – Delivers a flat, wide image circle with pinpoint stars across full-frame sensors.
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Compact Yet Powerful – A perfect balance between portability and professional-grade performance.
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Signature WO Craftsmanship – Precision-machined WIFD focuser, retractable dew shield, and unmatched mechanical finish.
A Tribute to 30 Years
From a homemade telescope in 1979 to becoming a global leader in apochromatic refractors, William Optics has always stood for artistry, innovation, and accessibility. The Ultra-Cat 76 · 30th Anniversary Edition is not only a high-performance imaging instrument, but also a symbol of our history—celebrating three decades of passion for the night sky, and looking forward to the future of astrophotography.
