With the built in flash it is possible to do 1st curtain slow syncs but when the flash is set to 2nd curtain it discharges at the begin in and the end of the exposure. Is there any way to only have it flash at the end of the exposure?
thanks, Fehn
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Slow Snyc Flash with 40d problems
With the built in flash it is possible to do 1st curtain slow syncs but when the flash is set to 2nd curtain it discharges at the begin in and the end of the exposure. Is there any way to only have it flash at the end of the exposure?
thanks, Fehn
dPS Forum Member
Short answer; NO.Originally Posted by fehn
Long answer; the first is a "pre-flash" for the E-TTL (Evaluative Thru-The-Lens) metering system needed to calculate the required flash output to appropriately expose the subject. The second is the "real" flash that actually exposes the scene and is fired just before the shutter curtain closes.
You also have the same two flashes when you use 1st curtain or 2nd curtain with a fast shutter speed (i.e., 1/250), however they fire so close together that you see them as a single flash.
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