BST 1.25" 58-deg UWA Planetary Eyepiece - 15mm
Outstanding Planetary and Lunar Eyepieces
These BST 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. Though primarily made for planetary observation, these eyepieces still excel when viewing deep sky objects.
More expensive eyepieces that have similar wide fields of view need many exotic glass elements to achieve that wide 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.
Each BST UWA Planetary eyepiece has 5 lens elements in 3 or 4 groups. These eyepieces provide high contrast, no scattered light, and the highest possible definition.
Comfortable Eye Relief
The eyepiece eye relief averages around 16mm for the entire series. The 25mm eyepiece features 20mm of eye relief. 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.
Please Note: While these eyepieces look similar to the TMB / TMB II ED eyepieces (and are also sold by some other sellers incorrectly under the TMB label), they are not the same as or copies of the 6-element TMB eyepieces. The factory making these eyepieces just uses the same external housing for the eyepieces.
Jan 18, 2019
15mm planetary eyepiece is greatPros: Cons: Comments:
I like this 15mm Planetary eyepiece very much. The fit and finish is very nice and solid and I especially like the rotating eyecup. I’ve used it in my 11” SCT f10 telescope and it gave me very sharp views nearly edge to edge, and the contrast was excellent with no ghosting. The sense of “snapping to focus” made it a joy to use.Bottom Line: Would you recommend this item? Yes
This review was provided courtesy of AgenaAstro.com
Pleiades Well-Known Member
- Skill Level
- Time with Product
Jun 19, 2018
- User Notes:
- Review by Andy
Outstanding EP at any price.Pros: Cons: Comments:
I bought this EP for Mars / Saturn as an upgrade from a standard Plossl, to use with an Orion SkyQuest, XT6. This EP is an obvious upgrade from the factory Plossls that are included with the scope. The first thing I noticed was the eye relief. Easy comfortable viewing even while wearing my glasses. I get tired of having to take them on and off with standard Plossl EP's. The next clear difference is the sharpness. Once you use a BST UWA, you will feel cheated with a lesser EP. Using my old EP, I had difficulty discerning details of Mars. Not a problem with the BST UWA.Bottom Line: Would you recommend this item? Yes
I'd give this EP an A+, and I will be buying more.
This review was provided courtesy of AgenaAstro.comSort by
|Apparent Field of View||58°|
|Barrel Size||1.25" (31.7mm)|
|Bolt Case Included||Yes - Free Agena Eyepiece Container|
|Bolt Case Size||Agena 52x80mm|
|Eye Relief by Design||14.3mm|
|Filter Threads||Standard 1.25" Filter Thread (M28.5 x 0.6)|
|Rubber Eye Guard||Yes|
|Blackened Lens Edges||Yes|
|Eyepiece Focal Length||10.1mm - 15mm|
|Eyepiece Field of View||51 - 60 degrees|
|Eyepiece Series||BST UWA Planetary|
|Barrel Type||Tapered barrel|
|Eyepiece Weight||5.10oz (144.58g)|