William Optics SWAN 20mm 1.25" Eyepiece


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William Optics SWAN 20mm 1.25" Eyepiece Product Info

SWAN: the perfect compromise between quality, cost, eye-relief and edge sharpness.
All with a SWA super-wide angle 72 deg. F.O.V. ! The ultimate 1.25 ” SWA eyepiece.
Try and compare! Ideal for SCT and refractor telescopes.


Perfect match with William Optics telescopes
• Outstanding super-wide field of view: 72 deg. F.O.V.
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Excellent contrast and light throughput for sharp viewing.

Great Contrast
• Fully internally blackened (lens edges and internal spacers).
• No internal reflections.
• No flaring or ghosting on high-contrast objects.
• Parfocal.

Light and Easy
• Soft rubber eyecup
• Long eye-relief: 17 mm
• No internal reflections or kidney bean effect

Terrific Fit and Finish
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 1.25” filters.


Internally baffled, : All lenses' edges and internal spacers blackened, : Fully multicoated
Model SWAN 20
Focal Length 20 mm
Lens Structure (#Elements/#Groups) 5/4
Field of View 72
Eye Relief 17 mm
Barrel 1.25"
Coating FMC
Parfocal Yes
Weight 100 g







Package Contents:

  • William Optics SWAN 20mm 1.25" Eyepiece

  • Model:
  • 0 Units in Stock
  • Manufactured by: William Optics
  • Category: William Optics Eyepieces

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