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" 15mm 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.
• Internally fully blackened (lens edges and internal spacers).
• No flaring or ghosting on high-contrast objects.
Light and Easy
• Soft rubber eyecup.
• Long eye-relief: 14mm.
• 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.
Nov 5, 2016
Great optics at a great price.Pros:
Quality Lenses,Great views in the WO BinoviewerCons: Comments:
These are remarkable EPs for the price point. I am using a pair of them with a WO binoviewer and an 8inch F10 SCT. Also, the construction is solid. No regrets with purchase.
This review was provided courtesy of AgenaAstro.com
Saguaro New Member
- Skill Level
- Time with Product
Feb 18, 2009
- User Notes:
- Review by saguaro of Tucson, AZ.
Huge 72 FOVPros:
Quality LensesCons: Comments:
High quality eyepiece right out from the box, is a pleasure just to look at it, Saturn looks crisp on my ETX 90 at 83x I always get a wow showing Saturn to people on this eyepiece.
I have also an very old Unitron 75mm telescope, is f/16 and the eyepiece on this telescope gives a perfect view of any planet or moon. I love this eyepiece.
Also on a 80mm refractor from Stellarvue the looks are great.
This review was provided courtesy of AgenaAstro.comSort by
Apparent Field of View 72° Barrel Size 1.25" (31.7mm) Bolt Case Included Yes - Free Agena Eyepiece Container Bolt Case Size Agena 42x60mm Coatings Fully Multi-Coated End Caps 2 Eye Relief by Design 14mm Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6) Focal Length 15mm Lens Elements 5 Lens Groups 4 Parfocal Yes Blackened Lens Edges Yes Manufacturer William Optics Eyepiece Focal Length 10.1mm - 15mm Eyepiece Field of View 71 - 80 degrees Eyepiece Series William Optics SWAN Barrel Type Tapered barrel Eyepiece Weight 3.17oz (90g)