david_pascolla1 Posted October 6, 1999 Share Posted October 6, 1999 Sometime when I am focusing/composing an image I notice that theflash fires off a number of very weak bursts. When I take the photothe flash works fine. Any thoughts? Link to comment Share on other sites More sharing options...
kurt_heintzelman Posted October 6, 1999 Share Posted October 6, 1999 David: Read your owners manual. In E-TTL (Evaluative-Through The Lens) mode, the flash fires off one or more pre-flashes before the mirror flips up and the data is then used to calculate the required flash output once the mirror flips up and the shutter is released. Link to comment Share on other sites More sharing options...
stephen_french1 Posted October 23, 1999 Share Posted October 23, 1999 also, If you are pressing the AE lock button (*) the 550 will fire a preflash, this is becuase the button becomes a Flash Exposure lock. Other than that the only time is should emit more than 2 is with a stroboscopic flash <p> Stephen French Link to comment Share on other sites More sharing options...
lawrie_weston Posted November 17, 1999 Share Posted November 17, 1999 If using EOS3 the flash is meant to multiple flash when you press DOF preview to show modelling, particularly good when using multiple 550'sWish I could turn it off when using ETTL for close-ups and really only want to check DOF. Link to comment Share on other sites More sharing options...
daniel_taylor1 Posted November 20, 1999 Share Posted November 20, 1999 Lawrie, <p> you can, but it is via a cumbersome custom function CF-6 Link to comment Share on other sites More sharing options...
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