Canon flash question

Discussion in 'Canon' started by Don, Aug 22, 2003.

  1. Don

    Don Guest

    I have been testing my Eos Elan II with a 550ex flash and a Sekonic L508
    meter and am confused as to the readouts that I am getting.

    Here is what I have done.
    Camera set at 1/60 F8 Iso 100 on manual
    Flash is set for ETTL
    Meter set for ISO 100
    Camera/flash at 8 feet from the flash meter
    room size about 12x12 feet white walls with only one single household light
    in the room for normal room lighting purposes only.

    I get a reading of F2.6 after triggering shutter

    When changing flash compensation on flash head the Meter reading on the
    flash meter does not change with either + or - compensation after
    additioonal triggering of shutter.

    Is this normal? Should not the flash meter read different readouts?

    Now when I set both the camera and flash on manual mode, at the above
    camera/flash settings I get a reading of
    F8.9 and as I decrease output the meter also changes in aperature as it
    should from F8 to F1.4

    I hope I made it clear for someone to answer as I find all this flash
    business very confusing. I have 2 550ex flash heads and they both indicate
    similar readouts on the flash meter.

    Don
     
    Don, Aug 22, 2003
    #1
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  2. Don

    Mark M Guest

    The Elan II/IIe most definitely uses E-TTL.
    The Elan II/IIe was the first Canon body designed for E-TTL (I think).
     
    Mark M, Aug 22, 2003
    #2
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  3. My guess is that your flashmeter is being triggered by the ETTL pre-flash
    (normally invisible to us mere mortals!). Hence why your reading doesn't
    change.
    Try setting your camera to delayed action, with the 10 second delay, and reset
    /turn on your flash meter after the pre-flash which fires before the mirror goes
    up, but before the main flash which fires when the lens aperture has been
    stopped down.

    Hope this helps - I assume you've read the manual. If not, you're not likely to
    make full use of the 550EX. It's a superb gun.
     
    Malcolm Stewart, Aug 22, 2003
    #3
  4. Don

    Dallas D Guest

    With any photography there are four basic variables that will determine what
    your exposure (par) should be.

    1. Your shutter speed.
    2. Your lens aperture.
    3. Film speed or CCD gain (ISO)
    4. The light source.

    Your initially chosen settings (as per your post) are all manual with the
    exception of the speedlite which you have set to E-TTL. E-TTL is effectively
    "program" mode for speedlites, meaning that if the other three variables are
    set to be constant, the speedlite will vary it's output to ensure a correct
    exposure (par, or 18% grey). This variance will be based on the light to
    subject distance and the ambient light in the room.

    Had you set your 550EX to manual mode and taken a reading with your
    flashmeter, you would get aperture readings consistant with the non-varying
    light coming out of the 550EX. By using E-TTL mode you are telling the 550EX
    that it has to vary its output based on the information it receives via your
    chosen camera settings to achieve par.

    If you set the 550EX to manual it will output the same amount of light with
    every burst. You would then have to vary one of the other three variables to
    achieve par.

    Just remember that a variation in any of the four variables will affect at
    least one of the remaining three. Whichever of the three you decide to
    adjust to accommodate the change in the other variable is entirely up to
    you. It can be shutter speed, aperture, ISO or the light (when shooting
    indoors with E-TTL).

    If you decide to use E-TTL with manual settings on your camera you will not
    be able to use a flashmeter. It will give you readings based on the
    pre-flashes E-TTL uses to determine what par should be.

    --
    "I smile mostly everywhere. Well, there's some people might disagree. But
    hey, I'm playin' with the Stones, man. You know, I mean why shouldn't I
    smile?"
    - Keith Richards

    www.imageunlimited.co.za
    ..
     
    Dallas D, Aug 22, 2003
    #4
  5. Don

    Robert Coe Guest

    : Åäóò â êóïå ãðóçèí è âëþáëåííûå. Ãðóçèí íà íèæíåé ïîëêå. Ïàðåíü ãîâîðèò
    : äåâóøêå:
    : - Ìàíü, äàâàé ÿ òåáÿ ñôîòîãðàôèðóþ!
    : - Äàâàé!
    : Íó îíè ïîçàíèìàëèñü ëþáîâüþ, ïîòîì ïàðåíü áðîñàåò âíèç ïðåçåðâàòèâ, è
    : ïîïàäàåò íà ãðóçèíà. Íó òîò ìîë÷èò.
    : Ïîòîì îïÿòü:
    : - Ìàíü, äàâàé ÿ òåáÿ ñôîòîãðàôèðóþ!
    : - Äàâàé!
    : Îïÿòü ïàðåíü áðîñàåò ïðåçåðâàòèâ è ïîïàäàåò íà ãðóçèíà. Òîò îïÿòü
    : ìîë÷èò.
    : Ïàðåíü:
    : - Ìàíü, äàâàé ÿ òåáÿ ñôîòîãðàôèðóþ!
    : Ãðóçèí íå âûäåðæàë:
    : - Åùå àäèí òàêîé íýãàòèâ è ÿ âàñ âñýõ ñôàòàãðàôèðóþ!
    :
    : Âûêëàäûâàéòå è âû ñâîè !!

    Very well said.
     
    Robert Coe, Dec 3, 2008
    #5
  6. Don

    jimkramer Guest

    A little too much accent for my ears.


    Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!
     
    jimkramer, Dec 3, 2008
    #6
  7. Don

    Noons Guest

    jimkramer wrote,on my timestamp of 3/12/2008 11:01 PM:
    Massive doses of Vitamin C work wonders in these cases...
     
    Noons, Dec 4, 2008
    #7
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