William Optics Swan Series Eyepiece
Best wide field upgrade for budget conscious deep sky observers.
A high-performance wide-angle eyepiece that delivers expansive, high-contrast views without the complexity of more expensive designs. Its generous eye relief and comfortable design make it an excellent choice for long observing sessions across a variety of telescope types.
$156.00
at
Agena AstroProducts
More SWAN options
Who it's for
- Stargazers seeking a wide-angle cinematic view of the night sky
- Deep-sky observers prioritizing bright views of faint nebulae and galaxies
- Eyeglass wearers needing extra space to see the full field
Who should skip it
- Owners of fast Newtonian reflectors requiring edge-to-edge sharpness
- Backpackers or minimalist astronomers using lightweight portable setups
- Lunar specialists demanding absolute clarity and zero internal light scatter
Performance breakdown
Panoramic immersion
The 72-degree field of view delivers a truly expansive, cinematic experience.
Viewing comfort
Generous 28mm eye relief makes long observation sessions effortless and strain-free.
Optical contrast
Blackened lens edges effectively suppress internal reflections for sharper, deeper views.
Build integrity
Anodized barrel construction provides a robust, premium feel in the hand.
Light transmission
Fully multicoated optics ensure bright, vivid images across the entire field.
System versatility
Standard filter threading allows for easy integration with existing accessory kits.
Key Specs
Focal Length
40mm
Barrel Size
2 inches (50.8mm)
Apparent Field of View
72 degrees
Eye Relief
28mm
Lens Elements
5
Lens Groups
3
Weight
570 g
Filter Thread
M48 x 0.75
Coatings
Fully Multi-Coated
Parfocal
Yes
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