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Thread: am new

  1. #1
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    am new

    please can someone tell me the difference between iris and exposure?

  2. #2
    Administrator Dave's Avatar
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    Have a look at this page:
    http://www.mediacollege.com/photogra...-exposure.html

    Basically, the iris is a device in a camera that controls exposure, and exposure is the amount of light that reaches the CDD or film.
    Dave Owen
    MediaCollege.com

  3. #3
    Senior Member SC358's Avatar
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    Quote: galaxymike
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    please can someone tell me the difference between iris and exposure?
    The iris (or aperture) is a mechanical mechanism, which is part of the lens that opens or closes to a tiny hole, to allow the light going thru the lens. Exposure is the result of all the variables that affect the light hitting the sensor. Those variables are as stated in Dave's link: the size of the iris, the speed of the shutter, ISO or the overall sensitivity (in this case, gain, since the sensor is electronic) and filters if used.
    SC358
    Relationships are based on compromises - behavior accepted is behavior repeated.

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