How does my Casio compact determine the amount of flash?

Discussion in 'Casio' started by Sammy, Jul 19, 2007.

  1. Sammy

    Sammy Guest

    I have a Casio EX-Z60. It is about a year old. Cost was about 200
    dollars. http://preview.tinyurl.com/2g2dts


    How does such a camera determine how much flash power to use? The
    result suggest that there is some sort of intelligent control going on.

    (1) Is there a detector which senses the amount of lght reflected by the
    subject and then in the middle of a flash it stops any power it does not
    want?

    (2) Does the camera determine how far away the subject is and then
    calculate the amoun tof illumination needed based on distance, stop
    number, sensitivity setting, etc.
     
    Sammy, Jul 19, 2007
    #1
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  2. Sammy

    Tony Hwang Guest

    Sammy wrote:
    > I have a Casio EX-Z60. It is about a year old. Cost was about 200
    > dollars. http://preview.tinyurl.com/2g2dts
    >
    >
    > How does such a camera determine how much flash power to use? The
    > result suggest that there is some sort of intelligent control going on.
    >
    > (1) Is there a detector which senses the amount of lght reflected by the
    > subject and then in the middle of a flash it stops any power it does not
    > want?
    >
    > (2) Does the camera determine how far away the subject is and then
    > calculate the amoun tof illumination needed based on distance, stop
    > number, sensitivity setting, etc.

    Hi,
    You sort of answerd your own question. Ever dealt with olden days
    Thyristor flash, guide number, coverage angle(H-V), etc.
     
    Tony Hwang, Jul 19, 2007
    #2
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  3. Sammy

    Sammy Guest

    > Sammy wrote:
    >> I have a Casio EX-Z60. It is about a year old. Cost was about
    >> 200 dollars. http://preview.tinyurl.com/2g2dts
    >>
    >>
    >> How does such a camera determine how much flash power to use? The
    >> result suggest that there is some sort of intelligent control
    >> going on.
    >>
    >> (1) Is there a detector which senses the amount of lght reflected
    >> by the subject and then in the middle of a flash it stops any
    >> power it does not want?
    >>
    >> (2) Does the camera determine how far away the subject is and then
    >> calculate the amoun tof illumination needed based on distance,
    >> stop number, sensitivity setting, etc.



    On 19 Jul 2007, Tony Hwang <> wrote:
    >
    > Hi,
    > You sort of answerd your own question. Ever dealt with olden days
    > Thyristor flash, guide number, coverage angle(H-V), etc.



    But where would the high speed sensor be to detect the reflected
    light and cut off the power to the flash?

    In those days it was unusual to have an electronic focus. Now we
    have it on every compact digicam then that makes electronic focus an
    alternative to determine flash exposure.
     
    Sammy, Jul 19, 2007
    #3
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