550ex/420ex/st-e2 flash ratio question

Discussion in '35mm Cameras' started by Rob, Feb 6, 2004.

  1. Rob

    Rob Guest

    Hi

    I have the following equipment (420ex, 550ex & st-e2 controller) and I've got
    a question about flash ratios.

    Do both flash units have to be the same in order for the flash ratio settings
    to work correctly?

    Thanks
    Rob
     
    Rob, Feb 6, 2004
    #1
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  2. Rob

    Bill Hilton Guest

    From: (Rob)
    I have the ST-E2 and two 550EX's ... I don't think it works as a wireless
    trigger for the 420EX, or at least the instruction booklet says the ST-E2 is
    "550EX-dedicated" and I didn't see any mention of the 420EX in the booklet.

    Maybe you can get the 420 to fire off the 550EX with the 420EX in manual mode
    (?) but I really doubt you'll be able to set up an auto flash ratio ...

    Bill
     
    Bill Hilton, Feb 7, 2004
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  3. Rob

    who? Guest

    The documentation for the Elan 7 as well as the 420EX state explicitly that
    the 420EX is designed to work with EITHER the ST-E2 or the 550EX as master.

    I have had no problems controlling the ratio using a mixture of 550EX and
    420EX and the photographic results correspond to my ratio settings. I have
    been using the 420EX with a slave ID set to "B." Whether you would get the
    same result if you used two 550EX units instead of the mixture (all else
    being equal) I can't say.

    experiment!

    Dave
     
    who?, Feb 7, 2004
    #3
  4. Rob

    Rob Guest

    When I press the self-test button on the st-e2, the 550 (slave on A) flashes
    first, then the 420 (slave on B) flashes. Which means that things are working
    properly.

    I've been playing with varying the ratios and the results do show a
    difference. But I'm not sure when I dial-in 1:3 (for example) if I'm really
    getting a 1:3 ratio.

    I wish I had access to a flash meter, then I'd be able to check the light
    output from each flash unit.

    I just had an idea....
    If I set the ratio to 1:1, then the subject should be evenly lit. If 1:1
    works, then it's probably safe to assume that other ratios will work properly
    as well.

    Thanks
    Rob



    In message <3CXUb.19333$> - "who?"
    :>
    :>The documentation for the Elan 7 as well as the 420EX state explicitly that
    :>the 420EX is designed to work with EITHER the ST-E2 or the 550EX as master.
    :>
    :>I have had no problems controlling the ratio using a mixture of 550EX and
    :>420EX and the photographic results correspond to my ratio settings. I have
    :>been using the 420EX with a slave ID set to "B." Whether you would get the
    :>same result if you used two 550EX units instead of the mixture (all else
    :>being equal) I can't say.
    :>
    :>experiment!
    :>
    :>Dave
    :>
    :>
    :>:>> >From: (Rob)
    :>>
    :>> >I have the following equipment (420ex, 550ex & st-e2 controller) and I've
    :>got
    :>> >a question about flash ratios.
    :>> >
    :>> >Do both flash units have to be the same in order for the flash ratio
    :>settings
    :>> >to work correctly?
    :>>
    :>> I have the ST-E2 and two 550EX's ... I don't think it works as a wireless
    :>> trigger for the 420EX, or at least the instruction booklet says the ST-E2
    :>is
    :>> "550EX-dedicated" and I didn't see any mention of the 420EX in the
    :>booklet.
    :>>
    :>> Maybe you can get the 420 to fire off the 550EX with the 420EX in manual
    :>mode
    :>> (?) but I really doubt you'll be able to set up an auto flash ratio ...
    :>>
    :>> Bill
    :>
    :>
     
    Rob, Feb 7, 2004
    #4
  5. Rob

    Dallas Guest

    Bill Hilton said:
    Both units work with the ST-E2 and you can set ratios between them as it
    pleases you.

    --
    Dallas
    "If I hadn't seen such riches I could live with being poor"
    ~ James

    Email flies better without wings.
    Now updated: www.imageunlimited.co.za
     
    Dallas, Feb 8, 2004
    #5
  6. Rob

    Dallas Guest

    Rob said:
    Ususally happens when the units are being tested without the shutter being
    fired.
    Your ratio will be 1:3. Trust E-TTL - it is your friend.
    Flash metering the E-TTL will not work. The pre-flash will confuse the
    meter.
    If you want to see how this set up works, take a look at the two B&W kids
    portraits on my website. These were shot using the ST-E2, 550EX bounced
    into a white brolly at full power, and the 420EX fired onto a silver
    reflector at half power (ie, 1:2 ratio).

    --
    Dallas
    "If I hadn't seen such riches I could live with being poor"
    ~ James

    Email flies better without wings.
    Now updated: www.imageunlimited.co.za
     
    Dallas, Feb 8, 2004
    #6
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