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  1. #1
    caheaton's Avatar
    caheaton is offline Bright Giants
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    Default Agena Astro 30mm Ultra Wide 2"



    Well, I finally bought my ultrawide for use with the XT10 (F/4.7). I went for the Agena instead of the Owl since with Agena's free shipping and one offered on clearence due to a bit of dust (which I couldn't see) I was able to buy it for a little less then Owl. This EP is sold under many names: 1rpd, Moonfish Ultra Wide, Agena Ultrawide, Owl Ultrawide, etc. They all offer similar specs:
    5 elements in 3 groups
    28mm of ER
    80 degree FOV
    2" barrel

    First impressions: This thing is big! (My next largest EP is a 1.25" 7-21mm zoom ). Close inspection showed good workmanship with deep green coatings. Holding the EP to my eye shows curvature a bit akin to looking through a mild fish eye lens, but the real test will be at the scope.

    I chose M45 for my test. I can't quite fit the entire cluster in the FOV with my 26mm Plossl, but it fits easily with this lens. The lens, however, is not perfect. The first thing I noticed is that the stars are not quite as sharp across the FOV, even at the center (but pretty darn close near the center to the Plossl). The stars become progressively defocused as I move towards the edge, with seagull shapes at the very edge (but not objectionable as they are at the periphery of my view anyway). Overall, a pleasing view and just fine for use as a finder or when you want to "take in the big picture". For detailed study, however, I will be switching to my Plossl. Eye relief was odd...it's listed as 28mm, but I felt I had to push my eye up to the lens to see the field stop. I could still see a nice image with my eye further away, but then could not see the entire FOV. I had not problems at all with kidney beaning or blackouts. The lens is usable with eyeglasses, but you may be almost touching the rubber eyeguard with your glasses. (I prefer to leave mine off). I did not notice any glare or reflections from bright stars located just outside the FOV.

    Overall, not bad at all for a $60 EP. This will certainly not be my everyday EP, but it will make an excellent finder and the one I grab first for large, extended objects such as the Veil, M31, M35, etc. This will also be an easy EP to use for afocal photography, due to the large eyelens and easy eye placement.
    Craig
    Last edited by caheaton; 11-17-2009 at 03:50 PM.

  2. The Following 4 Users Say Thank You to caheaton For This Useful Post:

    jrkirkham (11-18-2009),NDJollyMon (11-18-2009),sxinias (11-18-2009),WWPierre (11-17-2009)

  3. #2
    NDJollyMon's Avatar
    NDJollyMon is offline Bright Giants
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    Default

    Very nice eyepiece review. Thanks for taking the time to do it.
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    10"
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    sxinias's Avatar
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    Default

    As Pete said, thanks for taking the time to post your report.

 

 

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