William Optics SWAN Eyepieces

SWAN: with any focal length telescope, this great all-around eyepiece will not let you down! The incredibly wide 72 deg. F.O.V. makes it perfect for low-power rich-field viewing. A great optical achievement!

They use simple but sophisticated five-lens optical systems for generally higher contrast than the more complicated optical designs used in some other super wide angle eyepieces that use up to eight lenses. All lenses are fully multicoated for high light transmission. Lens edges and internal field stops are blackened to reduce internal reflections and improve contrast. The eyepiecerubber grip ring is useful for safer handling of the heavier 2” eyepieces in cold weather when wearing gloves. The eyepieces have soft roll down rubber eyecups for eyeglass use. They can be used for all types of observing, with all telescope types, but they are recommended for use with focal ratios up to f/6 and above. Dust caps are provided for both ends of each eyepiece. A soft protective drawstring-equipped velvet storage bag is standard equipment with each.

Spectacular Images!

• Outstanding super-wide field of view: 72 deg. F.O.V.
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Sharp and well contrasted.

Great Contrast

• Internally fully blackened (lens edges and internal spacers).
• No internal reflections
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Terrific Fit and Finish

• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2" filters.