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BST 1.25" Flat Field Eyepiece - 12mm

4.5 (2 Reviews) Read Reviews Write Review
Brand BST
Part Number E-BS-FF12
Availability available

Product Info

Manufacturer Description

Standard eyepieces provide sharp, pinpoint star images at the center of the field but as you look out toward the edges, stars often begin to get blurred and out of focus. Eliminating this distortion usually calls for expensive optical designs with additional lens elements to eliminate the field curvature. But these new BST eyepieces use a 5 or 6 element design that offers a flat field over the entire field of view at an attractive price.

Featuring large eye lenses, wide fields of view (from 53°-65°), and generous eye relief (from 9.6mm-24.4mm), these eyepieces are a pleasure to use. Fully multicoated lenses maximize light transmission and edge blackening of all lens elements ensures excellent contrast. Other features include safety recess grooves on the 1.25" barrels, standard 1.25" filter threads, and twist-up eyecups.

Reviews

4.5 (Based on 2 Reviews) 100% of reviewers recommended this product.
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    1. Guest

      Skill Level
      Unknown
      Time with Product
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      User Notes:
      Review by Erin
      1549293055
      Feb 4, 2019

      5.0 Great eyepiece!

      Pros:

      Cons:

      Comments:

      Nice build quality, love the twist up eyecup and very good optically. No internal reflections that I have seen and very crisp views. Agena’s service is excellent and they shipped very fast. I had the eyepiece within 2 business days of ordering it, and I live quite a distance away. Thanks Agena!

      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 Ted of Burnaby, BC Canada.
      1378080000
      Sep 1, 2013

      4.0 Flat field work horse

      Pros:

      Accurate,Compact,Strong Construction,Easy to Use,Quality Lenses

      Cons:

      Comments:

      I have a Tasco 11T and this eyepiece lived up to my expectations and more. This is truly my 'workhorse' mid-range piece. The eyerelief is perfect for me & easy to adjust. It provides nice clear star viewing right across the whole field (X75)and with no distortion at all. At X150 it also deliversn an excellent view of the moon & planets. Well worth the money & a pleasure to use.

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

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Apparent Field of View 60°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 52x80mm
      Coatings Fully Multi-Coated
      Height (with Eye Guard) 2.44" (62.0mm)
      Max Width 1.59" (40.5mm)
      End Caps 2
      Eye Lens Diameter 0.71" (18.1mm)
      Eye Relief by Design 15mm
      Field Stop Diameter 15.2mm / 0.60"
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 12mm
      Lens Elements 7
      Lens Groups 4
      Rubber Eye Guard Yes
      Blackened Lens Edges Yes
      Manufacturer BST
      Eyepiece Focal Length 10.1mm - 15mm
      Eyepiece Field of View 51 - 60 degrees
      Eyepiece Series BST Flat Field
      Barrel Type With safety undercut
      Eyepiece Weight 4oz (113.40g)