BST 1.25" 58-deg UWA Planetary Eyepiece - 6mm

Our Price: $55.00
Free shipping for this item in the US Click here for more info

Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.

US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.

International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.

In Stock (7 Available)
Ships by Next Business Day
Our Product ID: E-BS-UWAP6
Manufacturer SKU: E-BS-UWAP6
Item Can Ship: Worldwide
BST 1.25" 58-deg UWA Planetary Eyepiece - 6mm

More Views

  • BST 1.25" 58-deg UWA Planetary Eyepiece - 6mm

Quick Overview

  • Designed primarily for planetary observation but great for deep sky objects too
  • Wide 58 degree Field of View (FOV) in 2.5mm to 25mm focal lengths
  • Comfortable eye relief averaging 16mm across the series
  • Exceptional at nearly eliminating lateral color aberration and light scatter while retaining excellent sharpness, contrast and definition
  • Modified Plossl design with five lenses in three groups (except for the 20mm which has four groups)
  • In field use, perform as well as other, more expensive Orthoscopic and Plossl eyepieces
  • Excellent fit and finish with fully multicoated lenses and flat black anodized internal baffles and field stop

Product Details

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.

Eyepiece Series UWA Planetary
Focal Length 6mm
Barrel Size 1.25" (31.7mm)
Apparent Field of View (Mfg Specified) 58°
Eye Relief (Designed) 16.3mm
Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
Coatings Fully Multi-Coated
Lens Elements 5
Lens Groups 3
Blackened Lens Edges Yes
Barrel Type Tapered barrel
Protective Plastic Storage Container Yes - Free Agena Eyepiece Container
Protective Plastic Storage Container Size Agena 52x80mm
End Caps 2
Rubber Eye Guard Yes
Weight 5.3 oz / 150 g
Country of Manufacture China

You May Also Be Interested In...

BST 1.25" 58-deg UWA Planetary Eyepiece - 15mm

BST 1.25" 58-deg UWA Planetary Eyepiece - 15mm

Our Price: $55.00
BST 1.25" 58-deg UWA Planetary Eyepiece - 9mm

BST 1.25" 58-deg UWA Planetary Eyepiece - 9mm

Our Price: $55.00
BST 1.25" 58-deg UWA Planetary Eyepiece - 4mm

BST 1.25" 58-deg UWA Planetary Eyepiece - 4mm

Our Price: $55.00
BST 1.25" 58-deg UWA Planetary Eyepiece - 2.5mm

BST 1.25" 58-deg UWA Planetary Eyepiece - 2.5mm

Our Price: $55.00