{"id":34143,"date":"2025-11-17T13:22:14","date_gmt":"2025-11-17T12:22:14","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34143"},"modified":"2026-08-25T15:11:43","modified_gmt":"2026-08-25T13:11:43","slug":"william-optics-40mm-2-swan-eyepiece","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-40mm-2-swan-oculair\/","title":{"rendered":"William Optics 40mm 2\u2033 SWAN Eyepiece"},"content":{"rendered":"

William Optics 40mm 2\u2033 SWAN Eyepiece: a window to space<\/strong><\/h2>\n\n\n\n

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.<\/p>\n\n\n\n

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.<\/p>\n\n\n\n

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Which telescopes<\/h4>\n\n\n\n

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.<\/p>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

Combine the eyepiece with the Dura Bright 2-inch diagonal for the complete visual overview package.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n