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Tommie - sure for sports it does matter but for weddings? A kiss lasts couple of seconds,
Instead of "Say Cheese", "OK, EVERY BODY BLINK!!"
When I had to take some group pictures of kids, I asked all of them to close their eyes and then open them on the count of 3. On the count of 4/5 I snapped. Worked pretty well.....That and telling all the boys that if they blinked, I would have to photoshop a pink bow in their hair.
now if Nikon could give me frame or two BERORE , that would be a lot better
A lot depends on what you're shooting. If it's a subject (athlete or animal) that tends to move along a predictable trajectory, then yes, 4 is probably enough. For instance, if you're photographing a base stealer, you know where that runner is going. Same (to a certain degree) for a diving osprey. Others are much less predictable.