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.
Oct 22, 2018
BST 1.25" 25mm 58 degreePros: Cons: Comments:
This was a perfect improvement for my 140mm f/3.6 Schmidt-Newtonian. It gives me a wider FOV for the second step in location of bright stars; the first step being location in the Orion 6X30 RACI finder with its 7 degree FOV. And a bargain too! In this and many other purchases, AgenaAstro has always been reliable, prompt. and courteous.
This review was provided courtesy of AgenaAstro.comJun 8, 2018
3 Months now, my Favorite EPPros: Cons: Comments:
I bought this to replace the Plossl EP that came with my Orion. I've had it about 3 months, and it stays on my SkyQuest XT6 80% of the time. Bright and easy on the eyes, even with my glasses. I'm going to buy a 15mm to go with my 25mm.
This review was provided courtesy of AgenaAstro.comMar 18, 2018
Great BarginPros: Cons: Comments:
I've never used a $100+ eyepiece, so I can't tell you how it compares to those. Ivan tell you that it's a significant improvement over your $30-$40 Plossl of which, I own quiet a few from various companies. The eye relief seems better, but the image is remarkably better. For just a little motte money, you get a lot of improvement on the eyepiece. I'll 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 Coatings Fully Multi-Coated End Caps 2 Eye Relief by Design 20mm Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6) Focal Length 25mm Lens Elements 5 Lens Groups 3 Rubber Eye Guard Yes Blackened Lens Edges Yes Manufacturer BST Eyepiece Focal Length 20.1mm - 30mm Eyepiece Field of View 51 - 60 degrees Eyepiece Series BST UWA Planetary Barrel Type Tapered barrel Eyepiece Weight 4.80oz (136.08g)