William Optics UltraCat 108 f/4.8 WIFD Petzval APO Refractor - UC108

Coming in Spring, 2025!  Pre-Order Now!  Get a free 50 mm Ultraguide Guide Scope (valued at C$230) when you preorder the UltraCat 108 while supplies last!

The William Optics UltraCat 108 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.

Personalized Laser Engraving
Free customization for direct purchases, adding a personal touch to your telescope.

UltraCat 108 Specifications...

• Lens Type: 5-Element Advanced Petzval

• Lens Elements: Two (2) Super ED Glass, One (1) ED Glass, One (1)Lanthanum Glass, One (1) X-Element

• Focal Length: 518 mm

• Lens Diameter: 108 mm

• Focal Ratio: f/4.8

• Focuser: WIFD Rack & Pinion, compatible with EAF

• Adapters Included: Sensor Tilt Corrector, Rotator, M68, M54 & M48 Camera Adapters

• Optional Flattener? No Flattener Required

• T-Mount Supported: Canon EF and RF, Nikon F and Z, Sony E, Pentax K, MTF (M4/3), Fuji X

• Camera Format: Medium Format, Full Frame, APS-C, M4/3

• Tube Length (minimum and maximum): 510.5 mm retracted, 588.5 mm extended

• OTA Weight: 7.95kg (17.53 pounds)