tonyfanning Senior Member  834 posts Likes: 2 Joined Jan 2006 Location: Colwyn Bay,North Wales, UK More info | Mar 02, 2007 14:31 | #1 I am using a 20D and a 430EX speedlite. I am trying to get the second curtain flash to work, using the camera custom settings but the flash fires at the start of the exposure AND the end of the exposure??? Regards, Tony
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CurtisN Master Flasher  19,129 posts Likes: 11 Joined Apr 2005 Location: Northern Illinois, US More info | Mar 02, 2007 14:45 | #2 The first flash is the E-TTL pre-flash, which happens before the mirror goes up. You can see it in the viewfinder. "If you're not having fun, your pictures will reflect that." - Joe McNally
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FlashZebra This space available  4,427 posts Joined Mar 2006 Location: Northern Kentucky More info | Mar 02, 2007 14:46 | #3 The first flash you are seeing is likely the preflash used to determine exposure. This fires before the shutter opens so will not contribute to the exposure.
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FlashZebra This space available 4,427 posts Joined Mar 2006 Location: Northern Kentucky More info | Mar 02, 2007 14:48 | #4 Curtis N wrote in post #2803356  The first flash is the E-TTL pre-flash, which happens before the mirror goes up. You can see it in the viewfinder. The second flash is the "real" flash, which happens just before the shutter closes. Curtis,
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CurtisN Master Flasher 19,129 posts Likes: 11 Joined Apr 2005 Location: Northern Illinois, US More info | Mar 02, 2007 15:56 | #5 londuck wrote in post #2803381 Nice that it see that our answers are harmonious. Apparently, you have learned a lot from me! "If you're not having fun, your pictures will reflect that." - Joe McNally
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tonyfanning THREAD STARTER Senior Member 834 posts Likes: 2 Joined Jan 2006 Location: Colwyn Bay,North Wales, UK More info | Mar 02, 2007 16:32 | #6 Thank you guys! But why doesn`t it fire like this when I use the flash controls for 2nd curtain instead of the camera controls? Regards, Tony
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PacAce Cream of the Crop  26,900 posts Likes: 40 Joined Feb 2003 Location: Keystone State, USA More info | Mar 02, 2007 16:42 | #7 tony fanning wrote in post #2803920 Thank you guys! But why doesn`t it fire like this when I use the flash controls for 2nd curtain instead of the camera controls? I was about the ask the same question myself. ...Leo
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CurtisN Master Flasher 19,129 posts Likes: 11 Joined Apr 2005 Location: Northern Illinois, US More info | Mar 02, 2007 16:44 | #8 Regardless whether it's set on the flash or the camera, you will get both a pre-flash and a real flash if you use E-TTL mode. "If you're not having fun, your pictures will reflect that." - Joe McNally
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tonyfanning THREAD STARTER Senior Member 834 posts Likes: 2 Joined Jan 2006 Location: Colwyn Bay,North Wales, UK More info | Mar 02, 2007 17:06 | #9 I`ll have another play and get back to you1 Regards, Tony
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You should still get a preflash even when 2nd curtain is set on the camera. Are you sure you're not also setting the flash to manual mode by accident?