Outstanding Planetary and Lunar Eyepieces
Primarily made for planetary observation, these 1.25" fully multicoated (FMC) eyepieces give maximum detail and definition across the entire 58 degree field of view (FOV). A great value, these eyepieces are exceptional at nearly eliminating lateral color aberration and light scatter often associated with more expensive eyepieces that are better suited for deep space objects.
Each eyepiece has 5 lens elements in 3 groups - with the exception of the 20mm eyepiece which has 4 groups.
Agena WA HD Planetary Eyepieces vs. More Expensive UWA Eyepieces:
Premium (and costly!) eyepieces that have similar wide fields of view need many exotic glass elements to achieve that wide field of view - as many as 9 lenses or more. More lenses mean more cost and more glass, which attenuates the amount of light you see. That also means there are more air-to-glass surfaces that can scatter light - reducing contrast and sometimes causing multiple reflections (ghosting) when viewing very bright objects such as the Moon and planets. Extra lenses can also mean compromises in the overall design that can often lead to other issues.
One such issue of all that glass is lateral color aberration that appears as a cloud of false color around bright objects. Another issue is light scatter seen as a distracting halo or glow around bright objects. This can also reduce contrast. Our 58 degree eyepieces provide high contrast, no scattered light, and the highest possible definition.
Long Eye Relief - Up To 20mm!
Our eyepiece eye relief averages around 15mm and is as much as 20mm in the 25mm focal length model. Even the 2.5mm eyepiece has almost 17mm of eye relief! Experienced observers will truly appreciate such generous eye relief at significant magnifications.
Excellent Fit and Finish:
These eyepieces are fully internally baffled and all internal spacers have antireflection microbaffles on their edges with flat black anodizing to reduce reflections. Every air to glass surface is broadband multicoated for peak light transmission and outstanding contrast on subtle lunar and planetary detail. The lens edges are blackened to eliminate internal reflections.
Each eyepiece has a flexible rubber fold-down eyeguard. Dust covers are provided for both ends of each eyepiece. A groove is machined into the nose piece barrel to ensure the eyepiece is less likely to fall out of the diagonal or focuser.
Real World Results:
In an independent test the 4mm Agena WA HD planetary eyepiece, for example, performed visibly better than a 2x Barlowed 8mm top-tier Plossl costing about $100 - with an additional 6 degrees FOV. Another field test showed that our planetary eyepieces kept a better, more natural coloring of Jupiter across the entire field of view than a much more expensive brand at the same focal length. And the longer focal length eyepieces still provided excellent edge performance and true flat field even when used in a fast (f/5) scope. Such results are truly amazing, considering the low price of the Agena WA HD Planetary eyepieces.
Sep 25, 2015
The Agena HD eyepiece is a very nice eyepiece. Although it is advertised as a planetary eyepiece, I use it primarily for deep space observing. Since I wear eyeglasses, the generous eye relief is appreciated. The views are very good and so is the contrast. The eyepiece is lightweight and I do not have to rebalance my telescope. I do recommend it.
This review was provided courtesy of AgenaAstro.comOct 18, 2014
Very satisfactory eyepiecePros:
Lightweight,Accurate,Quality Lenses,Strong Construction,Easy to Use,CompactCons: Comments:
I chose this as a medium-power eyepiece for use in long-focus refractors. The field of view and eye relief are very comfortable and the image is sharp all the way across.
This review was provided courtesy of AgenaAstro.comJun 14, 2014
Great moderate power deep sky eyepiecePros:
Strong Construction,Easy to Use,Quality LensesCons:
Very sharp, comfortably wide field with excellent eye relief. Great for deep sky observing. Quite contrasty views. Only minor quibble was a rattle in the eyepiece upon receipt due to a loose retaining ring on the internal barlow element. This was easily remedied.
This review was provided courtesy of AgenaAstro.comSort by
Apparent Field of View 58° Barrel Size 1.25" (31.7mm) Bolt Case Included Discontinued Item Bolt Case Size Agena 52x80mm Coatings Fully Multi-Coated End Caps 2 Eye Relief by Design 14.3mm Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6) Focal Length 15mm Lens Elements 5 Lens Groups 3 Rubber Eye Guard Yes Blackened Lens Edges Yes Manufacturer Agena AstroProducts Eyepiece Focal Length 10.1mm - 15mm Eyepiece Field of View 51 - 60 degrees Eyepiece Series Agena WA HD Barrel Type Tapered barrel Eyepiece Weight 5.70oz (161.59g)