Ultra-Cat 56
The Ultra-Cat 56 is a high-performance 56mm apochromatic refractor, engineered for astrophotographers who demand exceptional portability without sacrificing optical precision, color accuracy, and wide-field performance.
Featuring a 5-element advanced Petzval optical design with super ED and lanthanum glass, paired with a fast f/4.8 focal ratio, the Ultra-Cat 56 delivers razor-sharp, perfectly flat images across a 50mm image circle. With a 269mm focal length, it is optimized for Full Frame, APS-C, and M4/3 sensors, and remains fully compatible with Medium Format cameras, making it an ideal ultra-wide-field imaging platform for deep-sky and large-scale nebula photography.
Key Features:
Advanced 5-Element Petzval Optics
Eliminates field curvature, ensuring sharp, edge-to-edge stars without additional flatteners.
50mm Large Image Circle
Fully supports Full Frame cameras, APS-C and M4/3 sensors for optimal performance. Compatible with Medium Format.
Fast f/4.8 Optics
Superior light-gathering capability, enabling deep-sky imaging with shorter exposure times.
WIFD (William Optics Internal Focuser Design)
Patented internal rack-and-pinion focuser ensures stable and precise focusing.
No vignetting or balance issues — ideal for astrophotography.
Compatible with EAF (Electronic Automatic Focuser) for precision focus control.
Sensor Tilt Xterminator (STX) & Rotator
Integrated tilt adjuster eliminates sensor misalignment, ensuring uniform image sharpness.
No Flattener Required
The optical design naturally corrects field curvature, simplifying setup.
Anti-Shrink Lens Cell Technology
Reduces thermal expansion effects, maintaining perfect optical alignment in any climate.
Patented Bahtinov Mask for Focusing
Built-in focusing aid ensures pinpoint star sharpness with ease.
Premium Build & Ergonomic Design
Lightweight yet robust (4.31 kg / 9.5 lbs) construction with a sleek anodized finish.
Patented handle bar design for enhanced portability and ease of use.
Versatile Camera Compatibility
Supports Canon EF, RF, Nikon F,Z, Sony E, Pentax K, MFT, and FUJI X mounts.
- 光學系統
- 5-Element Advanced Petzval
- 鏡片構成
- Super ED Glass x2 ED Glass x1 Lanthanum Glass x1 X-Element x1
- 焦距
- 269 公釐
- 口徑
- 56 公釐
- 焦比
- f/4.8
- 像圈
- 50 公釐
- 對焦系統
- WIFD R&P Focuser Compatible with EAF
- 調焦行程
- 0-30 mm
- 附帶轉接環
- Sensor Tilt Xterminator Rotator M54, M48 Camera Adapters
- 適配平場鏡
- 無須平場鏡
- T環支援
- Canon EF, RF Nikon F, Z Sony E Pentax K MFT (M4/3) FUJI X
- 相容片幅
- Full Frame APS-C M4/3
- 鳩尾規格
- Vixen ↔︎ Arca-Swiss
- 鏡筒長度
- 296.3 公釐 - 348.3 公釐
- 鏡管重量
- 2.56 公斤 / 5.64 lbs
- 總重量
- 3.21 公斤 / 7.08 lbs
選擇選項
完整配備內容
主鏡本體
魚骨對焦罩
M48, M54 adapter with wrench
雙用鳩尾板
筒箍環握把
便攜軟袋
內六角扳手組
熟悉的經典，全面進化的效能。
Ultra-Cat 56 將系列標誌性的五片式 Petzval 光學性能，濃縮於最靈活、最適合隨行的機身之中。在極致輕量的平台上，呈現銳利平坦的像場表現與鮮明真實的色彩還原。為橫跨星雲與遼闊星空而打造，Ultra-Cat 56 讓天文攝影者以絕對的自由與從容，追逐夜空的壯麗景象。
進階 Petzval 光學設計
超低色散光學元件 (ED)
無需平場鏡
視野表現
切換分頁，感受不同鏡款下的視野變化
Image Circle: 50 mm
Focal Length: 269 mm
Image Circle: 46 mm
Focal Length: 300 mm
Image Circle: 48 mm
Focal Length: 250 mm
貼心設計，精準到位
高精度影像校正結構
STX 像場傾斜調整器
了解更多
相機角度旋轉環
Compatible with Electronic Motorized Devices
Hassle Free Installation
( No Mounting Bracket Kit required )
Leading the market
Wo patented design
The Ultra-Cat 56 holds three unique patents, ensuring easy and perfect focusing along with precise coaxial image quality, preventing draw tube tilt issues caused by optical misalignment.
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