William Optics 9mm Swan Eyepiece - 1.25"
William Optics 9mm SWAN Eyepiece
The William Optics SWAN 9mm 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 9mm SWAN EPƒ???????????s panoramic views at 72 deg. F.O.V. will leave you speechless!
William Optics 9mm 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.
Questions & AnswersAsk a Question
9mm Swan EP ,Thinking about more eyepieces for my Binoviewer & looking at the review on this eyepiece ; the eyepiece was liked , but the 12mm eye relief could have been better , hard to look through ; That said I now wonder how they would preform in my W
These eyepieces would be a good choice for a binoviewer as long as you are okay with the 12mm of eye relief. The SWAN eyepieces are very good quality for the price.