CAT Series

Designed for serious astrophotographers and observatories alike, the Ultra-Cat 131 combines a fast focal ratio with uncompromising optical precision, enabling stunning deep-sky detail, rich contrast, and immersive wide-field compositions.

Precision-engineered with premium materials and optics, the Ultra Cat 108 WIFD is an ideal choice for discerning astronomers and astrophotographers who demand excellence in their equipment.

William Optics Red Cat 91

A high-performance astrophotography tool with a 5-element Advanced Petzval lens design that offers superior imaging capabilities.

Three Decades of Vision, Inspiring Generations to Come.

The William Optics Gran Turismo 81 is an apochromatic triplet refractor with a unique focuser design.

For astrophotographers seeking precision and clarity, this 76mm Petzval refractor is a standout option.

This William Optics WIFD 71 mm APO Astrograph is a premier tool for astrophotographers.

Introducing the new William Optics Ultra-Cat 56 — a fast, f/4.8 Petzval refractor designed for wide-field astrophotography! This astrograph delivers flat, sharp images of expansive nebulae and star fields in a lightweight, highly portable package

One of the greatest features of the RedCat 61 is the high-quality optics that make the telescope ideal for astrophotography

A precision-engineered telescope designed for astrophotography enthusiasts

WIlliam Optics RedCat 51 WIFD Gen 3 f/4.9 APO Refractor Telescope

This tilt adjuster is mainly designed for some cameras that have a tilted sensor which needs to be adjusted.