The William Optics SWAN 72° 9mm Eyepiece is a high-quality optical accessory designed for astronomical telescopes. This wide-angle eyepiece offers an expansive 72-degree apparent field of view, providing immersive, high-magnification views of celestial objects. With its short 9mm focal length, it's ideal for detailed observations of planets, lunar features, and compact deep-sky objects.
Designed for use with telescopes that accept 1.25-inch eyepieces. Ensure your telescope is compatible before purchasing.
Optical Design
Incorporates a sophisticated multi-element design optimized for wide-field, high-magnification viewing. The SWAN (Super Wide Angle) series utilizes premium glass and advanced coatings to deliver sharp, high-contrast images across its expansive field of view.
Field of View
Boasts an impressive 72-degree apparent field of view, offering a spacious and immersive observing experience even at high magnifications. This wide field is particularly advantageous for observing planets, double stars, and compact deep-sky objects.
Focal Length:
With a 9mm focal length, this eyepiece provides high magnification while maintaining a relatively wide true field of view. It's excellent for detailed observations of lunar craters, planetary features, globular clusters, and other small celestial objects.
Eye Relief
Offers comfortable eye relief, allowing for extended viewing sessions without eye strain. The exact eye relief specification should be confirmed with the manufacturer for the most up-to-date information.
Construction
Crafted with high-quality materials, including a durable metal housing and a soft rubber eye guard for comfort. The 1.25-inch barrel ensures compatibility with a wide range of telescopes and accessories.
Coatings
Features multi-layer anti-reflection coatings on all air-to-glass surfaces to maximize light transmission and reduce glare. This ensures high-contrast views with accurate color rendition, critical for planetary and lunar observations.
Versatility
While particularly well-suited for lunar and planetary viewing, this eyepiece is versatile enough for various astronomical applications. Its high magnification and wide field make it an excellent choice for splitting double stars, resolving globular clusters, or observing detail in planetary nebulae.
