re: Best binoculars

From: Walter Nissen (wnissen@tfn.net)
Date: Sat Jun 16 2007 - 15:48:32 EDT

  • Next message: Lutz Schindler: "Obs 16.06.07"

    Hi , Ronnie ,
    
    The earlier posts on this subject cover it well .
    
    I've been working on a tagline which I think I haven't yet had occasion
    to use :
    Ever wonder why experts use lower powers ?
    At a higher magnification , you will always see less of a dimmer ,
    fuzzier , shakier image .
    
    Of course , that assumes all other factors are equivalent .
    The IS system or the frame change the equation .
    For brighter objects , I like to use a pair of inexpensive 7x35's with a
    10 degree field of view .
    For fainter objects , larger , heavier , smaller FOV , more references
    to star charts , etc.
    A software-driven telescope would probably be even better .
    
    If you have any doubt about being able to bring the image focal plane
    into your eyes , be sure to look through them before committing to a
    purchase .
    There's a huge difference between eyeglasses on and eyeglasses off .
    Decide first which you think is better for you .
    If you have enough money , you can buy corrected oculars .
    
    Find a star party in your area and attend .
    You'll likely pickup a great deal of useful information .
    
    Also , be sure that the plethora of choices doesn't paralyze you .
    Many people end up with several pairs .
    Be sure to start with one .
    There's an overwhelming probability you'll like it .
    
    Since I began taking 50000 IU of Vitamin A daily ( 30 ? ) years ago ,
    my binoculars are much more useful at night .
    I expected better sensitivity at night , but the much more rapid
    dark-adaptation came as a very pleasant surprise .
    According to the Merck Manual ,
    http://www.merck.com/mmpe/sec01/ch004/ch004h.html
    Vitamin A toxicity sets in somewhere above 100000 IU daily , so don't
    overdo it .
    Some people use the non-toxic beta carotene instead of Vitamin A, but
    you'll have to take far more .
    My scan of the peer-reviewed literature failed to identify a particular
    agreed-upon ratio .
    There've been many recent papers .
    Maybe something like twice or 20 times as much .
    A year ago I started taking about 80 mg daily of bilberry , a food ,
    ( European blueberry ) .
    Within 4 days I found my visual field is brighter and my eyes can focus
    better when I'm not wearing glasses or using binoculars .
    There is much more to say about nutritional issues , but probably not
    here .
    
    Cheers ,
    
    Walter Nissen                   wnissen@tfn.net
    -81.8637, 41.3735, 256m elevation
    
    ---
    
    Of course, pacifism is better.  But better can also be dead.
    
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