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.
Oct 5, 2018
Nice eyepiece!Pros: Cons: Comments:
I got this eyepiece for the wider view and it’s stury construction. Gives great views. A bit of curvature with my f6.7 refractor, but tolerable. Agena’s service is great!
This review was provided courtesy of AgenaAstro.com
rainguy New Member
- Skill Level
- Time with Product
May 30, 2013
- User Notes:
- Review by rainguy of Lake Oswego, OR.
SHARP AND SOLID!Pros:
Quality Lenses,Strong Construction,Easy to Use,AccurateCons: Comments:
This eyepiece lives up to every claim in the Agena description. Sharp, crisp, bright and contrasty images edge-to=edge. Build quality, fit and finish are exemplary. A near perfect eyepiece for viewing open clusters. M44 never looked better.
This review was provided courtesy of AgenaAstro.comSort by
|Apparent Field of View||65°|
|Barrel Size||1.25" (31.7mm)|
|Bolt Case Included||Yes - Free Agena Eyepiece Container|
|Bolt Case Size||Agena 52x80mm|
|Height (with Eye Guard)||2.40" (61.0mm)|
|Max Width||1.59" (40.5mm)|
|Eye Lens Diameter||0.96" (24.3mm)|
|Eye Relief by Design||18.5mm|
|Field Stop Diameter||21.2mm / 0.83"|
|Filter Threads||Standard 1.25" Filter Thread (M28.5 x 0.6)|
|Rubber Eye Guard||Yes|
|Blackened Lens Edges||Yes|
|Eyepiece Focal Length||15.1mm - 20mm|
|Eyepiece Field of View||61 - 70 degrees|
|Eyepiece Series||BST Flat Field|
|Barrel Type||With safety undercut|
|Eyepiece Weight||4.10oz (116.23g)|