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 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, 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 33mm 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.
Extremely Long eye-relief: 25mm.
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 2" filters.
Oct 20, 2018
Top-Drawer, as UsualPros: Cons: Comments:
Williams-Optic stuff is always terrific. This eyepiece is no different. EXCELLENT quality, performance and look/feel. Great service, yet again, from AgenaAstro!!
This review was provided courtesy of AgenaAstro.comJan 28, 2013
Great on SCT, fair on fast scopePros:
Comfortable ViewingCons: Comments:
I have both this and the 40mm versions. It's wonderful on my C-11 but marginal on my 8" f/5. The 40mm is unusable on that scope, but this one is OK. There is coma on the edges, but it is not enough to keep me from using it. It's great being able to see all of M45 at the same time. This eyepiece gives a 140' REAL field of view (51' on the C-11).
This review was provided courtesy of AgenaAstro.comSort by
Apparent Field of View 72° Barrel Size 2" (50.8mm) Bolt Case Included Yes - Free Agena Eyepiece Container Bolt Case Size Agena 65x120mm Coatings Fully Multi-Coated End Caps 2 Eye Relief by Design 25mm Filter Threads Standard 2" Filter Thread (M48 x 0.75) Focal Length 33mm Lens Elements 5 Lens Groups 4 Parfocal Yes Blackened Lens Edges Yes Manufacturer William Optics Eyepiece Focal Length 30.1mm - 40mm Eyepiece Field of View 71 - 80 degrees Eyepiece Series William Optics SWAN Barrel Type Tapered barrel Eyepiece Weight 14.46oz (410g)