1. Final Announcement: We're Saying Goodbye to AstronomyConnect. Read Our Closing Notice.
Dismiss Notice
New Cookie Policy
On May 24, 2018, we published revised versions of our Terms and Rules and Cookie Policy. Your use of AstronomyConnect.com’s services is subject to these revised terms.

More Views

BST 1.25" 58-deg UWA Planetary Eyepiece - 7mm

4.7 (3 Reviews) Read Reviews Write Review
Brand BST
Part Number E-BS-UWAP7
Availability available

Product Info

Manufacturer Description

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.

Reviews

4.7 (Based on 3 Reviews) 100% of reviewers recommended this product.
Rating Distribution
Sort by
  • Date
  • Rating
  • Useful
    1. Guest

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by John B.
      1541054323
      Oct 31, 2018

      4.0 Overall very good, only one complaint

      Pros:

      Cons:

      Comments:

      I have had the 4mm and 6mm version of this eyepiece for some time so I kinda knew what to expect. The 6mm is very good; this 7mm version is equally good except for having a bit more scatter (the halo around bright objects). But its still a very good value.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by Asoke K.
      1526191469
      May 12, 2018

      5.0 Good planetary eyepiece

      Pros:

      Cons:

      Comments:

      This review is for the 7mm.

      The eyepiece was delivered in good condition and a little faster than expected. Thanks to Agena's service.

      I just have a chance to test it with good seeing last night. The object is Jupiter and the scope is 90mm f/10 Achromat (at 128x). The image is clear, sharp with very good off-axis CA correction (much better than my stock 10mm plossl). Four cloud bands (with details in NEB and SEB) presented as well as the colorful GRS. No internal reflection was noticed.

      Good value for the money.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. joe1950

      joe1950 New Member

      Skill Level
      Unknown
      Time with Product
      Unknown
      User Notes:
      Review by JOSEPH D.
      1521603241
      Mar 20, 2018

      5.0 Excellent at a very good price

      Pros:

      Cons:

      Comments:

      The BST line of eyepieces are excellent with sharp images, good contrast and low scatter. I've compared to other makes and they do well all the time. Lots of focal lengths to choose and all comfortable field of view and eye relief.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    Sort by
    • Date
    • Rating
    • Useful

      Specifications

      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 16.5mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 7mm
      Lens Elements 5
      Lens Groups 3
      Rubber Eye Guard Yes
      Blackened Lens Edges Yes
      Manufacturer BST
      Eyepiece Focal Length 5.1mm - 10mm
      Eyepiece Field of View 51 - 60 degrees
      Eyepiece Series BST UWA Planetary
      Barrel Type Tapered barrel
      Eyepiece Weight 4.90oz (138.91g)