Canon Wireless TTL

Discussion in 'Digital Photography' started by David Grandy, Aug 19, 2003.

  1. David Grandy

    David Grandy Guest

    I have a Canon 10D, a 550EX flash, a 420EX flash and I just picked up a second 420EX. I really like the idea of the Canon Wireless TTL with ratios. When I just had two flashes I would set the 550 to group A and the 420 to group B and then use the ratio setting on the Master 550 to determine the ratio.

    Now with the second 420 I can add another flash and this I should think would be Group C. On one site it was mentioned that I could control this third flash by changing the power settings, +3 to -3. I just don't know how to do this with the 420 which has no independent settings other than E-TTL. As far as that goes I don't know how I'd do this with a second 550 (if I had one) since that flash won't work on Wireless TTL if it's set at manual - or so I'm told.

    Any thoughts?
    David Grandy, Aug 19, 2003
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