Product Overview
The William Optics UltraCat108 is a cutting-edge 108mm apochromatic refractor designed for astrophotographers who demand top-tier performance. Featuring a 5-element advanced Petzval optical design and a fast f/4.8 focal ratio, it delivers breathtaking edge-to-edge clarity and vivid detail, making it perfect for capturing expansive celestial views. Its robust build, exceptional optics, and innovative features redefine the standard for astrophotography.
Key Features:
Advanced 5-Element Petzval Design
Eliminates field curvature, providing sharp, flat-field images without requiring additional flatteners.
60mm Superior Image Circle
Fully supports full-frame and medium-format cameras for wide-field and detailed astrophotography, outperforming standard 106mm telescopes.
F/4.8 Fast Optics
Offers exceptional light-gathering capability for vibrant deep-sky photography.
WIFD (William’s Internal Focuser Design)
Patented internal focuser ensures precise, stable, and hassle-free imaging, avoiding balance issues and eliminating vignetting.
Anti-Shrink Lens Cell Technology
Minimizes thermal expansion and contraction, maintaining perfect optical alignment in any environment.
Sensor Tilt Corrector
Integrated and patented design eliminates distortion, optimizing sharpness and detail for professional-level results.
Built-In Patented Bahtinov Mask
Simplifies focusing for pinpoint precision, a feature that sets it apart from competitors.
Patented Handle Bar Design
Combines ergonomic usability with enhanced portability.
Specification
Lens Type 5-Element Advanced Petzval
Lens Elements Super ED Glass x2 ED Glass x1 Lanthanum Glass x1 X-Element x1
Focal Length 518 mm
Diameter 108 mm
Focal Ratio f/4.8
Image circle 60 mm
Focuser WIFD R&P Focuser Compatible with EAF
Adapter Included Sensor Tilt Corrector Rotator M68, M54, M48 Camera Adapters
Optional Flattener No Flattener Required
T-Mount Supported Canon EF, RF Nikon F, Z Sony E Pentax K MFT (M4/3) FUJI X
Camera Format Medium Format Full Frame APS-C M4/3
Tube Length 510.5 mm - 588.5 mm
OTA Weight 7.95 kg / 17.53 lbs
Total Weight N/A
