Eyepiece Sky-Watcher WA-66 6mm 66° 1.25″

Sky-Watcher WA-66 6mm 66° 1.25″ wide angle eyepiece

Are you looking for an eyepiece that offers a genuinely comfortable observing experience without unnecessary compromises? The Sky-Watcher WA-66 6mm wide angle eyepiece with a 66° apparent field of view is a choice that will satisfy both beginners taking their first steps in astronomy and experienced observers who want reliable, affordable optics with excellent performance. A combination of modern optical design, quality materials and thoughtful ergonomics makes it a versatile companion for almost any telescope.

Optics and image quality

The eyepiece uses a five-element optical design with multi-layer anti-reflection coatings on all optical surfaces. This maximises light transmission and reduces unwanted reflections to a minimum - the resulting image is contrasty, bright and true to detail. The 66° field of view places this eyepiece in the category of genuinely wide-angle designs, and the correction across the field is surprisingly good for telescopes with a focal ratio down to f/6.

In terms of image quality, it is comparable to well-established Plössl SWA 58° eyepieces, while its wider field clearly outperforms older Erfle designs. In practice, this means easier star-hopping to objects and more relaxed tracking of moving targets.

Build quality and compatibility

The body of the eyepiece is made entirely of metal, which ensures durability and a long service life. The glass elements are fitted precisely and held firmly in place. The 1.25″ barrel is the standard industry format and is compatible with the vast majority of telescopes available on the market.

The barrel also includes a filter thread for standard 1.25″ filters, so you can use lunar, colour or UHC/OIII filters without any adapters. A fold-down rubber eyecup allows comfortable viewing both with and without glasses - simply fold it down and the eye relief adjusts to your needs.

Who is this eyepiece for?

The Sky-Watcher WA-66 6mm 1.25″ eyepiece works especially well as an upgrade over the eyepiece included in a standard telescope kit. It provides a noticeably wider field of view and a more comfortable observing session overall.

• Suitable for observing the Moon, planets and bright deep-sky objects
• Beginners will appreciate the wide field that makes it easy to centre objects
• Experienced observers will value the precise build quality and solid optical performance at a very attractive price

Magnification and eye relief

A 6mm focal length delivers medium to high magnification when used with a typical refractor or reflector telescope - well suited for detailed views of planetary surfaces or double stars. The generous eye relief keeps observing comfortable even during longer sessions at the telescope.

About Sky-Watcher

Sky-Watcher is one of the world's leading brands in astronomical optics, with a long-standing reputation for excellent value for money, reliability and wide availability of accessories and spare parts. The Sky-Watcher WA series eyepieces are part of a broad accessory ecosystem that makes it easy to expand and customise your astronomy setup as your experience and interests grow.

Specifications