SWAN 40mm Eyepiece

The William Optics 2" Swan 40mm Eyepiece , is very economically priced yet offers extremely good performance, being internally baffled and blackened, and fully multicoated it features a breath taking 72 degree field of view. This is a huge lens rich field eyepiece at a very reasonable price.

The 5 element optics of Swan eyepieces are well made and will work well with telescopes having a focal ratio of F6 or slower.

The superwide 72 deg field of view are fully multicoated lenses, sharp and well contrasted, have excellent transmittance, and outstanding chromatic aberration correction.

With internally fully blackened (lens edges and internal spacers) there is no flaring or ghosting on high contrast objects.

The soft rubber eyecup and extremely long eye-relief has no internal reflections makes it a pleasure to use.

William optics is well renowned for it's superb range of optical accessories. Many amateur astronomers use them because the believe they peform just as well as more expensive brands.

Shown here is the 40mm,33mm and 25mm models.

Swan Eyepiece


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

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