Precision Petzval Optics

Innovative Petzval optics in the William Optics Redcat series provide sharp, high-contrast images with minimal chromatic aberration. The Petzval design inherently flattens the field, eliminating the need for an external field flattener. The Petzval design of the Redcat series simplifies astrophotography by eliminating backfocus adjustments, ensuring cameras can be easily attached for a user-friendly experience.

Ultra-Portable Design

Redcat series offers ultra-portable solutions for astrophotography with compact, lightweight designs for easy transportation and setup.

Extra-low Dispersion (ED) glasses

Deliver sharp, vibrant images with true-to-life colors, significantly reducing chromatic aberration.

Bahtinov Mask

The CAT dew shield features a removable lens cover, with our patented Bahtinov Mask revealed by unscrewing the face plate. The clear design allows for brighter star patterns, and precise focusing for astrophotography.

Versatile CAT Handlebar

The CAT Saddle Bar Handle, offers a solid handle with a built in dovetail chamber for use with the WO Uniguide scopes, or other Vixen style guiding/finder scopes and accessories.

The (WIFD) William Optics Internal Focuser Design

This innovative and revolutionary design combines a precision (Patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography. Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside. The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers.

Field Rotator

The super smooth field rotator includes markings for every degree, and a solid thumbscrew position lock.

Soft Carry Case

All CAT Series telescopes are supplied with an attractive soft carry case
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