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Thread: Cropping factor/multiplier factor?

  1. #1

    Default Cropping factor/multiplier factor?

    Hi All

    Can anybody tell me when is cropping factor considered or taken into considerations?
    Hehe...all I know is that it's use for calculating the focal length of a lens when it's use on a dslr.
    This is my understanding, please correct me if I'm wrong.
    For a 28-90 mm lens, when use on a dslr, it becomes, 45 (28*1.6) - 144 (90*1.6).

  2. #2

    Default

    Quote Originally Posted by ptm
    Hi All

    Can anybody tell me when is cropping factor considered or taken into considerations?
    Hehe...all I know is that it's use for calculating the focal length of a lens when it's use on a dslr.
    This is my understanding, please correct me if I'm wrong.
    For a 28-90 mm lens, when use on a dslr, it becomes, 45 (28*1.6) - 144 (90*1.6).
    Yes it something like that. It oso known as the focal length multiplier or FLM for short.

    It because of the different in sizes of the CCD/CMOS that give birth to FLM.
    For more info look here
    http://www.dpreview.com/learn/Glossa...tiplier_01.htm
    Note oso that the FLM varies from brand to brand!

  3. #3

    Default

    thanks for the link
    didn't know that the perspective will be different too.
    in photography sense, is this FLM good or bad, or rather what are the pros and cons?
    Last edited by ptm; 30th September 2003 at 05:22 PM.

  4. #4

    Default

    Quote Originally Posted by ptm
    didn't know that the perspective will be different too.
    ummmm, i think the perspective remains the same.

  5. #5

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    Quote Originally Posted by noobee
    ummmm, i think the perspective remains the same.
    ooops, sorry...yes the perspective remains the same, got mixed up by "links jumping"
    it changes when different focal length lens are used, eg. between a 28mm and 78mm.

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