William Optics 15mm Swan Eyepiece - 1.25"

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William Optics 15mm Swan Eyepiece - 1.25"
Item # WO-E-SWA15
  • This William Optics SWAN Eyepiece has a 15mm focal length, 72 field of view and an excellent 14mm of eye relief.
  • Parfocal, to reduce or eliminate focusing when changing magnification.
  • The William Optics SWAN Eyepiece has a black anodized 1.25" barrel with rubber eyecup, filter threads, and blackened internal threads and lens edges.
  • No flaring or ghosting on high-contrast objects.


William Optics 15mm SWAN Eyepiece

The Swan eyepieces are super wide angle designs with 72° apparent field of view. They use simple but sophisticated five-lens optical systems for generally higher contrast than the more complicated optical designs used in some other super wide angle eyepieces that use up to eight lenses. All lenses are fully multicoated for high light transmission. Lens edges and internal field stops are blackened to reduce internal reflections and improve contrast. The eyepiece rubber grip ring is useful for safer handling of the heavier 2” eyepieces in cold weather when wearing gloves. The eyepieces have soft roll down rubber eyecups for eyeglass use. They can be used for all types of observing, both day and night!

The William Optics SWAN 15mm Eyepiece has soft roll down rubber eyecups for eyeglass use. They can be used for all types of observing, with all telescope types, but they are recommended for use with focal ratios up to f/6 and above. Dust caps are provided for both ends of each eyepiece. A soft protective drawstring-equipped velvet storage bag is standard equipment with each.

This 5-element super-wide angle 15mm SWAN EP’s panoramic views at 72 deg. F.O.V. will leave you speechless!

William Optics 15mm SWAN Eyepiece Features

  • Fully Multicoated lenses for excellent transmittance..
  • Reduced chromatic aberration.
  • Improved sharpness and contrast throughout the field.
  • No internal reflections, kidney beaning, pin-cushion or other distortions.
  • Smooth design for no hook up in your focuser.
  • Threaded for filter usage.
  • Rubber grip ring for safe, comfortable handling.
William Optics Product Number: SWAN15
Additional Information

Additional Information

Manufacturer William Optics
Optical Design Wide Angle
Barrel Size 1.25"
Warranty 2 Year Warranty
Eyepiece Field of View - Apparent 72º
Eyepiece Focal Length 15mm
Eyepiece Eye Relief 14mm
Eyepiece Manufacturer Series William Optics Swan
Eyepiece Weight 3.1 oz.
Field Stop Not supplied by manufacturer
Number of Lens Elements & Groups 5 elements, 4 groups
Special Feature None
Comes with Dust Caps? Yes
Comes with Eye Guard? Yes

Customer Reviews 1 item(s)

15mm swan
Good performer on slow scopes, saturn looks great on my 75mm f/16 Unitron and in my 90mm ETX.
Nice eye relief.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Alejandro Gastelum / (Posted on 8/4/2007)
Included Items

Included Items

  • William Optics Swan 15mm 1.25" Eyepiece
  • Velvet Storage Bag
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