SWAN 40mm (2") Eyepiece (E-SWA40)
SWAN 40mm (2") Eyepiece (E-SWA40)
SWAN 40mm (2") Eyepiece (E-SWA40)
SWAN 40mm (2") Eyepiece (E-SWA40)
SWAN 40mm (2") Eyepiece (E-SWA40)
SWAN 40mm (2") Eyepiece (E-SWA40)

William Optics

SWAN 40mm (2") Eyepiece (E-SWA40)

Regular price
$ 130.00 Sold out
Sale price
$ 130.00
Unit price

Please contact Cloud Break Optics to order this product


SWAN: a huge-lens rich-field eyepiece at a very reasonable price! 

Fully multicoated advanced design for breathtaking and jaw-dropping 72 deg. F.O.V. views. 
Try it out on the Milky Way!

A True Spacewalker! 
• Marvelous 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 flaring or ghosting on high-contrast objects. 
• Parfocal.

Ease of Use 
• Soft rubber eyecup.
• Extremely long eye-relief: 28 mm.
• No internal reflections.

Terrific Fit and Finish 
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser. 
• Threaded for 2” filters.



Internally baffled, All lenses' edges and internal spacers blackened, Fully multicoated
Model SWAN 40
Focal Length 40 mm
Lens Structure (#Elements/#Groups) 5/3
Field of View 72
Eye Relief 28 mm
Barrel 2"
Coating FMC
Parfocal Yes
Weight 570 g

Personal Upgrade Path

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