William Optics 1.25\" Swan Series Eyepiece - 20mm For Sale
![William Optics 1.25\](telescope-image-large/g/68oAAOSwl2haFO~q/s-l1600/William-Optics-1-25-Swan-Series-Eyepiece-20mm.jpg "William Optics 1.25\")
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
William Optics 1.25\" Swan Series Eyepiece - 20mm:
$79.00
William Optics 1.25\" Swan Series Eyepiece - 20mm William Optics 1.25\" Swan Series Eyepiece - 20mm
Description Ordering Info USA Shipping International Orders Returns Our eBay Store1. PRODUCT DESCRIPTION
The Swan eyepieces are super wide angle designs with a 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 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, 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 1.25\" 20mm SWAN EP\'s panoramic views at 72 deg. FOV will leave you speechless! A premium eyepiece at a fraction of the cost its worth!
Super Wide FOV
Outstanding super-wide field of view: 72 deg. FOV
Fully Multicoated lenses for excellent transmittance.
Reduced chromatic aberration.
Improved contrast compared to similar EPs.
Great Contrast
Internally fully blackened (lens edges and internal spacers).
No flaring or ghosting on high-contrast objects.
Parfocal.
Light and Easy
Soft rubber eyecup.
Long eye-relief: 17mm.
No internal reflections, kidney beaning or other distracting distortions.
Terrific Fit and Finish
High-resistance anodized black barrel.
Smooth design for no hook up in your focuser.
Threaded for use with 1.25\" filters.
Eyepiece SeriesSWAN SeriesFocal Length20mmBarrel Size1.25\" (31.7mm)Apparent Field of View (Mfg Specified) 72° Filter Threads Standard 1.25\" Filter Thread (M28.5 x 0.6) Eye Relief 17mmCoatings Fully Multi-CoatedLens Elements 5 Lens Groups 4 Blackend Lens Edges Yes Barrel Type Tapered barrel Height (With Eyeguard Extended) Rubber Eye Guard Weight100 g
Note: Occasionally, the product you receive might have a slightly different cosmetic appearance or labeling than what is shown. This can often change from batch to batch according to the whims of the manufacturer. However, you will always receive a brand new, original product as described above.
Back to Top
