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Message: <blockquote data-quote="pistnbroke" data-source="post: 109220" data-attributes="member: 9514">Grandpaw I think you want to get your logic modules overhauled ...what your adjustment does is adjust the iTTL to under or over expose from standard that is not the same as adjusting the power of the flash..iTTL works by cutting off the flash when exposure is sufficient. If the Guy is in Command mode then the flash sends out pre flashes for triggering unrelated to the flash for exposure.Note the exposure adjustment it +3 to -3 not as you stated.Even if you have the setting at -3 the flash may go up to full power dependent on the distance of the object being photographed.If objects are very close they may be over exposed because the minimum duration of the flash still give too much light.</blockquote>