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Thread: how to calculate the number of times a zoom is?

  1. #1
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    Red face how to calculate the number of times a zoom is?

    how to many the zoom in mm to the "x" one?

    eg, what is 12x zoom equivalent to? 12x = 300mm??

    actually, how to calculate one?

  2. #2

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    take the most tele end of the zoom divide by the the widest end.

    55-200mm = 200/55 = 3.63 zoom

    35-350mm = 350/35 = 10 zoom

    28-135mm = 135/28 = 4.8 zoom

  3. #3
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    Quote Originally Posted by Paul_Yeo
    how to many the zoom in mm to the "x" one?

    eg, what is 12x zoom equivalent to? 12x = 300mm??

    actually, how to calculate one?
    depends on the widest angle. there's no fixed value for cameras.

    it's different for binoculars where the base is 50mm.

  4. #4

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    Quote Originally Posted by Paul_Yeo
    how to many the zoom in mm to the "x" one?

    eg, what is 12x zoom equivalent to? 12x = 300mm??

    actually, how to calculate one?
    Use your longest end and divide by the widest end .... for example .... 28 - 300 = 300 / 28 = 10.7 = 11x

  5. #5
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    OK got it! thanks

    so my lens is
    24-120 => 120/24 = 5x zoom
    70-300mm => 300/70 = 4.2X zoom

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    Quote Originally Posted by Paul_Yeo
    OK got it! thanks

    so my lens is
    24-120 => 120/24 = 5x zoom
    70-300mm => 300/70 = 4.2X zoom
    Yeah, but pretty useless to calculate in zoom factor.

    Your 70-300 is longer reach than your 24-120VR and yet it's only 4.2x vs 5x.

  7. #7
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    I have a couple of 1x zoom..
    -Express yourself not in words-
    http://www.majere2sg.com

  8. #8
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    Quote Originally Posted by majere2sg
    I have a couple of 1x zoom..
    Hahaha....
    But u should be the richest.

  9. #9
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    Quote Originally Posted by Paul_Yeo
    OK got it! thanks

    so my lens is
    24-120 => 120/24 = 5x zoom
    70-300mm => 300/70 = 4.2X zoom
    As ESPN says, for SLR lenses, is a pretty useless measure. More relevant to talk about focal lengths.

  10. #10
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    so, it is more for compact camera huh.

    i asked bcos i saw one Panasonic camera got 12x zoom.... that;s why me asked what's the "mm" equvialent loh.

  11. #11
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    Quote Originally Posted by Paul_Yeo
    so, it is more for compact camera huh.

    i asked bcos i saw one Panasonic camera got 12x zoom.... that;s why me asked what's the "mm" equvialent loh.
    if you meant the panasonic fz20, its a 36-432mm lens (35mm equiv) lens. It is actually only 6-72mm but can achieved 36-432mm (35mm equiv) due to the 6x cropping from a smaller sensor size.
    -Express yourself not in words-
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