Swan 20mm Eyepiece

The William Optics 1.25" Swan 20mm Eyepiece is the perfect compromise between quality, cost, eye-relief and edge sharpness. All with a SWA super-wide angle 72 degree field of view. Possible the ultimate 1.25" Swan eyepiece.The Ideal choice for SCT and refractor telescopes.

This eyepiece is the perfect match with William Optics telescopes, offering outstanding super-wide field of view: 72 degree field of view. Fully Multicoated lenses for excellent transmittance, with outstanding chromatic aberration correction. and excellent contrast and light throughput for sharp viewing.

The contrast is great with fully internally blackened (lens edges and internal spacers), no internal reflections, flaring or ghosting on high-contrast objects.

Light and easy to use, soft rubber eyecup, long eye-relief, 17 mm no internal reflections or kidney bean effect

William optics are well renowned for their superb array of optical components. A considerable number of amateur astronomers employ them simply because the are convinced that they do the job just as as well as others costing twice the price.

Swan 20mm Eyepiece


  • Model SWAN 20
  • Focal Length 20mm
  • Lens Structure (#Elements/#Groups) 5/4
  • Field of View 72
  • Eye Relief 17mm
  • Barrel 1.25"
  • Coating FMC
  • Parfocal Yes
  • Weight 100g

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