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.
Feb 4, 2019
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!
This review was provided courtesy of AgenaAstro.comSep 1, 2013
Flat field work horsePros:
Accurate,Compact,Strong Construction,Easy to Use,Quality LensesCons: 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.
This review was provided courtesy of AgenaAstro.comSort by
|Apparent Field of View||60°|
|Barrel Size||1.25" (31.7mm)|
|Bolt Case Included||Yes - Free Agena Eyepiece Container|
|Bolt Case Size||Agena 52x80mm|
|Height (with Eye Guard)||2.44" (62.0mm)|
|Max Width||1.59" (40.5mm)|
|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)|
|Rubber Eye Guard||Yes|
|Blackened Lens Edges||Yes|
|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)|