Light as a cat, sharp as its eyes.
Highlights
Precision Petzval Optics
Innovative Petzval optics in the William Optics Redcat series provide sharp, high-contrast images with minimal chromatic aberration.
Ultra-Portable Design
Redcat series offers ultra-portable solutions for astrophotography with compact, lightweight designs for easy transportation and setup.
Effortless Camera Integration
The Petzval design of the Redcat series simplifies astrophotography by eliminating backfocus adjustments, ensuring cameras can be easily attached for a user-friendly experience.
Petzval
APO Design
Extra-low Dispersion (ED) glasses
Deliver sharp, vibrant images with true-to-life colors, significantly reducing chromatic aberration.
Needs NO Flattener
The Petzval design inherently flattens the field, eliminating the need for an external field flattener.
High-precision polishing
Our lenses undergo high-precision polishing, setting a standard of excellence that surpasses industry norms, ensuring optimal performance in all conditions.
Cat 91 WIFD
Advanced Petzval
5 elements Petzval design, contains 3 super ED glasses. Achieves a flawless spot diagram across a medium-format image circle.
MiniCat 51
UltraFast Petzval
6 elements Petzval design, contains 2 super ED glasses. Features a cutting-edge optical system doubles the efficiency of traditional Cat telescopes. Its 14-degree field of view is perfect for capturing wide-field deep-sky images, making it an ideal choice for astrophotographers looking to maximize playability and reduce time spent on mosaicking.
Sharp And Quick Aperture
| MiniCat | Cat 51 |
|---|---|
| f/3.5 | f/4.9 |
| Cat 61/71 | Cat 91 |
| f/4.9 | f/4.9 |
WIFD Focuser
The William Optics Internal Focus Design (WIFD) relocates the focuser to the center of the telescope.
This design effectively eliminates tube tilt issues caused by the weight of cameras and accessories. By ensuring a balanced structure and precise internal sliding of fixed optics, the WIFD system delivers stable, clear observations while maintaining a dust-free and easy-to-maintain focuser environment.
Learn more about WIFD
Compatible with Electronic Motorized Devices
Hassle Free Installation
( No Mounting Bracket Kit required )
Fast and accurate focusing
Integrated Bahtinov mask in dew shield cap (Patent number: US 10,564,409 B2) ensures precise focusing. Made of high-definition and stable optical PMMA. Enhances astrophotography experience with quick and accurate adjustments.
Just For Astrophotography
Tilt Adjuster
The built-in tilt adjuster makes it easy to correct camera sensor tilt problem.
Camera Angle Rotator
Correct any angular discrepancies, and get the perfect angle on your images.
Mini Cat
- APS-C
Cat 51
- Full-Frame
- APS-C
Cat 61
- Full-Frame
- APS-C
Cat 71
- Full-Frame
- APS-C
Cat 91
- Medium-Format
- Full-Frame
- APS-C
Which Cat is right for you?
MiniCat 51 $898.00 View |
Cat 51 $858.00 View |
Cat 61 $1,398.00 View |
|
|---|---|---|---|
| Lens Type | 6-Element Petzval | 4-Element Petzval | 4-Element Petzval |
| Focal Length | 178 mm | 250 mm | 300 mm |
| Diameter | 51 mm | 51 mm | 61 mm |
| Aperture | f/3.5 | f/4.9 | f/4.9 |
| Image circle | 43.2 mm | 48 mm | 46 mm |
| Focuser |
WIFD R&P Focuser
Compatible with EAF |
WIFD R&P Focuser
Compatible with EAF |
WIFD R&P Focuser
Compatible with EAF |
Cat 71 $1,698.00 View |
Cat 91 $2,598.00 View |
Ultra-Cat 108 $3,598.00 View |
|
|---|---|---|---|
| Lens Type | 4-Element Petzval | 5-Element Advanced Petzval | 5-Element Advanced Petzval |
| Focal Length | 350 mm | 448 mm | 518 mm |
| Diameter | 71 mm | 91 mm | 108 mm |
| Aperture | f/4.9 | f/4.9 | f/4.8 |
| Image circle | 48 mm | 55 mm | 60 mm |
| Focuser |
WIFD R&P Focuser
Compatible with EAF |
WIFD R&P Focuser
Compatible with EAF |
WIFD R&P Focuser
Compatible with EAF |