Wes Allen Offline Buy and Sell: On
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p.1 #21 · Camera mode for receptions | |
I didn't find anything on Neil's site, but the results with google says Av and Tv both expose for the ambient/background and the flash is for fill. But, I only spent a minute or two on it. I pretty much never use Tv, so not sure how it works in real life.
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PhotosByRDD wrote:
I've seen two statements made that directly contradict what I was taught about Canon eTTL systems. As I've always be given to believe in AV (aperature priority/aperature value) the system assumes ambient as main and uses the flash to add fill. In TV (shutter priority/time value) assumes the flash to be the main light. If you think about it there's a logic to it. If ambient is too bright you tend to close down the aperature. If too dark, to open the aperature to let in more light. So it's not too much of a stretch to assume the user is basing exposure on ambient in AV mode. Shutter speed is often adjusted with the freezing of motion in mind. Nothing freezes motion in an image better than flash.
Take a shot using eTTL flash in AV mode... note shutter speed. Switch to TV mode match shutter and aperature speed and take a second shot. Compare the results and the output of the flash in the two shots. Everytime I've tried it I get a much higher power dump in TV mode than in AV mode. If Canon's eTTL system treated both the same the power dumps would be equal.
As memory serves you can find an article on how Canon eTTL responds to AV vs TV modes by camera flash guru Neil Van Niekerk's www.planetneil.com.
What mode do I use for receptions? It depends on what I'm shooting and the result I'm after. At any given wedding I'm likely to use a combination of AV, TV and Manual modes.... non-flash, bounced on-camera flash, off-camera flash, and mixed on-camear/off-camera flash. 
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