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ETTL flash

r9jacksonr9jackson Registered Users Posts: 129 Major grins
edited June 28, 2011 in Technique
If I have one flash connected to an ETTL off camera flash and I have another flash close to it will the ETTL flash trigger the other flash and increase the power. Other flash set as slave.
Randy

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    ziggy53ziggy53 Super Moderators Posts: 23,834 moderator
    edited June 28, 2011
    I moved this to the Technique forum where you will find other similar threads.

    Yes, Canon wireless E-TTL/E-TTL II can be used in a fashion to increase effective flash output. 2 identical flashes will provide a maximum effective increase in Guide Number (GN) of factor 1.4x.

    4 identical flash units will have a maximum effective increase in GN of factor 2x.

    It is my experience that bright sunlight reduces the reliability and range of the wireless capability of Canon flashes otherwise adding flashes would be a reasonably good method for overcoming sunlight, especially in FP/HSS mode.
    ziggy53
    Moderator of the Cameras and Accessories forums
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