- Focal Length: 15mm
- Barrel Size: 1.25"
- Apparent FoV: 72 Degrees
- Eye Relief: 14mm
William Optics 15mm Swan Eyepiece - 1.25" - DISCONTINUEDThe Swan eyepieces are super wide angle designs with 72 degree 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.
|Dust Caps Included||Yes|
|Eye Guard Included||Yes|
|Eyepiece Apparent FOV||72 degrees|
|Eyepiece Eye Relief||14mm|
|Eyepiece Focal Length||15mm|
|Eyepiece Special Feature||None|
|Field Stop||Not supplied by manufacturer|
|Lens Elements & Groups||5 elements & 4 groups|
|Model||William Optics Swan|
|Optical Design||Wide Angle|
|Warranty||2 Year Warranty|
- William Optics Swan 15mm 1.25" Eyepiece
- Velvet Storage Bag