Chris Hacker
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 p.1 #5 · Beginner Q: P Mode = AV & TV? | |
One thing that's easily missed with P mode, though, is that you can actually control it - it's a listed feature, something like "program shift". My Canon A-1, one of the first SLRs to have a "P" mode, from 1978, allows this as well if I remember right.
By turning the dial normally used in Av and Tv modes, you basically turn it into a semi-automatic Av mode. Turning the dial just changes the aperture, and picks the correct shutter speed based on that... which is what Av mode does.
Thus, I use P mode a fair amount, usually for less important situations - it is, like the others said, basically an automatic mode that allows you more control over settings. You don't worry too much about getting the right exposure, important in spontaneous situations, and then if you have more time to think before your shot you can control the aperture as well to get it just right.
That said, it's not too difficult to just use Av in the same situations most of the time, which often will yield you a better image, but that requires more concentration on the camera and you can easily miss out on experiencing the moment first-hand and can miss it in-camera as well. Unless you're a paid professional and aren't concerned about sharing the moment with your friends or family, P mode has its use. Of course, a lot of practice in Av will give you the speed to use it in those situations I just said P mode was for (yes, I need more practice in Av mode  )
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