Product details
The astrographs in the Cat series are very easy-to-use optics for nature and astrophotography. They are available in the RedCat and SpaceCat colour variants.
At the heart of the optical set-up is the Petzval design: four lenses in three elements provide a colour-corrected and, above all, flat field of view. No external field flattener lens (flattener) is required!
Other special features include the field rotator with filter holder, with which the camera can be rotated, and the tilting collimator for perfect collimation of the image plane with the camera’s sensor plane.
The patented William Optics Bahtinov mask is integrated into the lens’ dust cap. With this focus mask it is very easy to set the correct focus for bright stars.
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.
