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Thread: Can someone this Flash details?

  1. #1

    Default Can someone explain these Flash details?

    Its printed at the back:

    DIN
    15 18 21 24 27

    ASA
    25 50 100 200 400

    and f-stops above those numbers at various combinations. Any idea?

    what's DIN? ASA is the ISO ah?

    Thanks!
    Last edited by KSeet; 24th October 2003 at 04:10 PM.
    www.kelvinseet.com
    See the world through my eyes

  2. #2
    Deregistered chunsan's Avatar
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    Default ASA, DIN , etc

    Hi,

    There are a lot of explanation needed.

    I just give you some and hope other can give you more.

    Din or ASA is a grading of film sensitivity by different countrty. Din, if I am not wrong is Europe grading and ASA is American grading. Din 21 is the same as ASA 100.

    Some call it film speed - speed of accepting the light.

    Aperture and shutter speed is a combination, called exposure, to allow proper amount of light to create an images on the film.

    For example, on bright cloudy day, aperture of f16 at the shutter speed of 1/250 secs can be changed to an aperture of f8 at the shutter speed of 1/500 secs - either exposure will be accurate. ( if you measure it using your camera of light meter )

    This comibination is also call exposure value - EV for short.

    I hope it give you some idea to digest first.

    I hope other can continue to add on to assist you.

    Regards
    chunsan

  3. #3

    Default

    Quote Originally Posted by chunsan
    Hi,

    There are a lot of explanation needed.

    ...

    Regards
    chunsan
    Hi Chunsan!

    Thanks for the enlightenment! Now I know what's DIN. I really appreciate your reply!

    By the way, my flash seems to be a super simple flash. No buttons to press, no settings to choose. Guess its just a shoot and flash kind.

    Any suggestions how to test my flash distance etc? Thanks!
    www.kelvinseet.com
    See the world through my eyes

  4. #4
    Deregistered chunsan's Avatar
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    Default Flash

    Hi,

    I hope this will help you.

    Usually there should be a table at the back of the flash to show distance,
    ASA. and aperture to use.

    Eg: At 10 feet, ASA 100 the F-Stop usually is F5.6 - all this is for a normal flash with GN of 30.

    Base on Inverse law of light, every change of distance will change the power of light. Eg: if the distance is cut by 2 feet to 8 feet, your aperture should be f8. Vise versa if it add another 2 feet, the f stop should be f4.

    Another method is using light meter. use a measuring tape and measure the distance. Start with 10 feet distance and fire the flash to test the f stop. Use every 2 feet in change of distance.

    Is your flash is purely a TTL flash for the camera made - eg nikon or canon?
    Is that is the case, perhaps it has no flash distance table at all.

    Then you need to change to a higher model flash of your camera made( eg nikon or canon).

    Hope this help you.

    Regards
    chunsan

  5. #5

    Default

    hi chunsan!

    thanks for the info! My flash does have a table behind, so I'll try to interpret it according to what you said. Thanks for the assistance!


    REally appreciate your guidance!
    www.kelvinseet.com
    See the world through my eyes

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