William Optics 40mm 2″ SWAN Eyepiece

William Optics 40mm 2″ SWAN Eyepiece: a window to space

The William Optics SWAN 40 mm is a 2-inch wide-field eyepiece with an apparent field of view of 72 degrees. The combination of long focal length and wide field provides the largest possible patch of sky in a single view: extended nebulae, star fields, and the Milky Way at their finest.

The five-element design is multi-coated and the lens edges are blackened to prevent stray light. With 28 mm of eye relief, viewing is comfortable, even with glasses, and the fold-down eyecup can be adjusted to your preferred viewing position. The filter thread accepts 2-inch filters directly.

Which telescopes

The eyepiece requires a 2-inch focuser or diagonal. On telescopes with a slow f-ratio, the field performs at its tightest; on very fast optics, edge stars become softer, which is typical for this price range.

Featured accessories

Combine the eyepiece with the Dura Bright 2-inch diagonal for the complete visual overview package.

For whom yes and for whom no

• ✓ Deep-sky observers looking for maximum field of view
• ✓ Glasses wearers, thanks to 28 mm eye relief
• ✗ Owners of 1.25-inch connections only

Specifications

You can find more accessories for this brand at the William Optics brand page.