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    Default strongest hand held telescope/binoculars?



    what is the strongest hand held telescope/binoculars?

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    Chandramohan P.R's Avatar
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    Default

    We are not boxing or fighting with binotelescope.Only observing.Why strongest maen More magnification????

  3. #3
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    Default

    Also - don't get TOO hung-up on magnification.

    Bear in mind that as magnification goes up, image brightness goes down - so if you want high power, you will need a large aperture (main lens) to go with it. (to gather more light)
    Also, avoid binoculars if you are going above about 20x - as magnification goes up, it becomes increasingly difficult to align the two optical trains with each other, leading to double images, which aren't just annoying, but they will also cause headaches with prolonged use.

    I've looked through binoculars that went from 36x to 108x, with 70mm aperture lenses at the front.
    Image was acceptable (although slightly mis-aligned) at 36x - but when zooming, that mis-alignment got worse, and was terrible by the time the binocs got to about 60x.
    Image was also too dim to be useful, by the time I got beyond 60x.

    Divide the objective size, by the magnification, and that will give you the exit pupil size in mm.
    As a rule of thumb, you want 1.5mm or bigger exit pupil for daytime use - 4mm or bigger for astronomy
    Examples:
    10x50 binocs give a 5mm exit pupil
    20x60 spotter scope would have a 3mm exit pupil

    And if you go for binocs, AVOID ZOOMS LIKE THE PLAGUE.
    If you want a zoom, get a spotter scope.
    There's no such thing as a 'good' zoom binocular
    Last edited by Carlos_dfc; 08-25-2008 at 11:53 AM.

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    thanks Carlos thats a great summary
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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