






Ultra-Cat 76
Ultra-Cat 76 是一款高性能 76mm 五片消色差折射鏡,專為追求極致清晰度與真實色彩還原的天文攝影者打造。採用五片式進階 Petzval 光學設計,結合超低色散(Super ED)與鑛藍玻璃(Lanthanum)元件,具備快速的 f/4.8 焦比,可在 50mm 影像圈內呈現極致銳利且平坦的影像。除支援全片幅、APS-C 與 M4/3 感光元件外,亦相容中片幅相機,實現優異的廣域深空攝影表現。
五片式進階 Petzval 光學設計
消除像場彎曲,提供邊緣至中心皆銳利的星點影像,無需額外平場鏡。
50mm 大影像圈
完整支援 Full Frame、APS-C 與 M4/3 相機感光元件,並兼容中片幅系統,確保卓越的成像品質。
快速 f/4.8 光學系統
具備優異集光能力,可在較短曝光時間內拍攝深空天體。
WIFD(William’s Internal Focuser Design)
專利中置式對焦系統,確保對焦穩定與精準。無暗角、無重心偏移,完美適用於天文攝影,並相容 EAF 電子自動對焦器以實現精密控制。
Sensor Tilt Xterminator(STX)與旋轉機構
內建傾斜調整系統與像旋,方便進行焦平面精密校正,確保整體畫面的一致銳利度。
無需平場鏡設計
Petzval 結構本身具備平場修正能力,安裝更簡潔。
抗熱脹冷縮鏡座技術
有效減少溫度變化對光軸的影響,在任何氣候下皆能維持完美光學校準。
內建專利 Bahtinov 對焦罩
專利號 US 10,564,409 B2,讓使用者能快速且精準完成星點對焦。
優質工藝與人體工學設計
輕量化但堅固的結構(4.31 kg / 9.5 lbs),搭配經陽極處理的高質感外觀。專利提把設計提升攜帶性與操作便利性。
多系統相機相容性
支援 Canon EF / RF、Nikon F / Z、Sony E、Pentax K、MFT 及 FUJI X 等多種接環系統。
Pairs well with
- Lens Type
- 5-Element Advanced Petzval
- Lens Elements
- Super ED Glass x2 ED Glass x1 Lanthanum Glass x1 X-Element x1
- Focal Length
- 365 公釐
- Diameter
- 76 公釐
- Focal Ratio
- f/4.8
- Image circle
- 50 公釐
- Focuser
- WIFD R&P Focuser Compatible with EAF
- Focus travel
- 0-20 mm (Ruler to 21mm)
- Adapter Included
- Sensor Tilt Xterminator Rotator M54, M48 Camera Adapters
- Optional Flattener
- No Flattener Required
- T-Mount Support
- Canon EF, RF Nikon F, Z Sony E Pentax K MFT (M4/3) FUJI X
- Camera Format
- Medium Format (Compatible) Full Frame (Recommended) APS-C M4/3
- Dovetail Type
- Vixen ↔︎ Arca-Swiss
- Tube Length
- 363 公釐 - 415 公釐
- OTA Weight
- 3.81 公斤 / 8.4 lbs
- Total Weight
- 4.98 公斤 / 10.98 lbs
選擇選項







What's in the box

Main Tube

Bahtinov Cap

M48, M54 adapter with wrench

Dual-side Plate

Mounting Ring Handle bar

Riser Blocks

Soft Carry Case

Allen Key Set


The Cat, Evolved.
The Ultra-Cat 76 distills the series’ 5-element Petzval excellence into a compact form, delivering clarity, flat-field precision, and rich color fidelity. Designed for versatility and ease, it empowers astrophotographers to capture expansive, true-to-life celestial vistas with the confidence of a purpose-built imaging instrument.


Advanced Petzval
Researched and developed by WO, the innovative 5-element Petzval design redefines telescope optics. This advanced system achieves a flawless spot diagram across a medium-format image circle.
Extra-low Dispersion (ED) glasses
Contains 2 Super ED, 1 ED glasses and lanthanum lenses with advanced fully multi-coated, delivering sharp, vibrant images with true-to-life colors, significantly reducing chromatic aberration.


Needs NO Flattener
The Petzval design inherently flattens the field, eliminating the need for an external field flattener.
Never easier to capture deep sky objects

comprehensive configuration
Precision Imaging Adjustment

Sensor Tilt Xterminator (STX)
The built-in STX allows quick side-access tilt adjustments without removing the camera.
Learn More
Camera Angle Rotator
Correct any angular discrepancies, and get the perfect angle on your images.


Compatible with Electronic Motorized Devices
Hassle Free Installation
( No Mounting Bracket Kit required )
Leading the market
Wo patented design
The Ultra-Cat 76 holds three unique patents, ensuring easy and perfect focusing along with precise coaxial image quality, preventing draw tube tilt issues caused by optical misalignment.
:
Internal Focuser
The WIFD focusing Design relocates the focuser to the center of the telescope, addresses the issue of tube tilt caused by the weight of accessories and cameras.
Learn More

Integrated Bahtinov mask
Laser engraved on high-definition and stable optical PMMA. Enhances astrophotography experience with quick and accurate adjustments.
CAT Handle Bar
Crafts for enhanced portability and versatility.
Mounting Ring
Designed for seamless functionality without compromising on stability. Engineered with wide surface contacts, this innovative ring ensures a secure fit while enabling fast, easy detachment.
