Aperture priority sometimes slows down my shutter so much that it blurs the shot when I'm taking fast moving objects. This happens when I meter on the darker parts of the object, and all the light gets absorbed, and the sensor thinks there's not enough light, thus pushing the shutter speed down.
Shutter priority sometimes changes my aperture, affecting my DOF.
As with Raptor I also use Av mode almost exclusively with a bit of help from Exposure Compensation. Yes, there is a risk that you'll have the camera set to a small aperture which will result in a blurred picture when the photo is taken in poor light. But it helps to use a little human touch to estimate what the conditions are like, and start opening up the aperture as soon as the light goes bad. And this happens even before I put my eye to the viewfinder.
On the odd occasions that I use Manual mode, it'll be for static night shots and maybe the rare Bulb shots. I'm just slow and prefer the speed at which Av mode works...getting the shot is what matters most.
:bsmilie: Well, even if it is not plofessional it with plobably get you a shot even when the action is very sudden and there is no time for preparation.
We shouldn't get hung up about what mode to use and what mode others use the most. Manual mode will allow you to learn about exposure in the most efficient way. But ultimately getting the shot is all that counts. Spend more time composing the shot and getting it right, rather than change lenses and flick around with dials for the exposure.
M mode- Usually in a controlled lighting environment (studio)
A mode- Nearly all of the time with exposure compensation
S mode- Usually for motor racing on a well lit day to get the exact shutter speed I want
P mode- I dont think ive used it yet
Auto mode- When the family want to use the camera!