William Optics WIFD Ultra-Cat 76 APO Refractor (For a Limited Time: Free William Optics 32 mm UniGuide Scope With Purchase!)

High-Performance Imaging in a Compact Refractor

For astrophotographers seeking precision and clarity, this 76mm Petzval refractor is a standout option. Designed with a sophisticated five-element lens system using premium-grade optical glass, it delivers exceptional image sharpness and color accuracy. The integrated Petzval design eliminates the need for additional field flatteners and simplifies back focus requirements, making it camera-ready straight out of the box. It produces tack-sharp stars across the full image field—perfect for both full-frame and medium-format sensors.

With a fast f/4.8 focal ratio and a focal length of 365mm, this telescope excels in wide-field deep-sky imaging. Its generous 50mm image circle supports larger sensors without vignetting or distortion, allowing for richly detailed captures of nebulae, star fields, and galaxies. Internally, the focuser system operates smoothly and securely, keeping your imaging gear stable while minimizing flex and sag, even with heavier setups.

Optimized for Astrophotographers

Built with performance in mind, this refractor uses one ED and two Super ED glass elements to reduce chromatic aberration and field curvature. The result: crisp, high-contrast images with excellent color correction across the entire field. The optical quality makes it easy to resolve fine structures within celestial objects, from delicate filaments in nebulae to well-defined star clusters.

The scope comes equipped with both M54 and M48 adapters, allowing you to easily connect your preferred imaging accessories. Whether you're a seasoned imager or just getting started, this setup provides a user-friendly platform for capturing incredible views of the night sky.

Precision Focus with Internal Mechanics

Rather than adjusting the position of your camera or other gear, this refractor features an internal focusing mechanism that shifts the optical elements themselves. This design helps maintain the alignment and stability of your imaging train, which is especially useful when using heavier equipment. It also reduces the risk of vignetting and other issues associated with traditional drawtube focusers. Additionally, this system is compatible with electronic autofocusing units (EAF), enabling fully automated focusing routines for a hands-free imaging experience.