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When you're shooting in Aperture Priority mode, you get to choose the Aperture and the camera figures everything else out. So why would you want to choose your Aperture? Well remember that's what controls your depth of field. So in an enviornment where we have our model Jackie and this beautiful church in the background we may want to have everything in focus or maybe not. So lets try a few different scenarios and see what looks better. Let's start with F9. Remember, a bigger number means more in focus. So we're going to go to F9, I'm going to get down on the ground and kind of point up at Jackie and at the church, and let's see what it looks like.
(audio playing) Now as we can see here, in this shot, there's a lot in focus. Jackie's in focus, and the church in the background's pretty sharp as well. Now, that looks okay, but maybe I want a little bit more separation so let's drop it down to about F2.8, and see how that looks. Now as you can see, we have a lot more separation between Jackie and the background.
Now this particular lens here goes all the way down to F1.2. Now I realize that most people aren't going to have a lens like this. But I just want to show you what that super-big aperture will give you. So let me take this all the way down to 1.2 and get one more shot. Now, as you can see, we have a really shallow depth of field. The background is totally out of focus. Now, again, you can't always do that, because your chances are you're not going to always have a lens quite that fast. But here's another tip, if you do want to get that really shallow depth of field, get closer. So if I go to F2.8 or F4 and I get really close to Jackie and the background behind her is even further away, it's going to be that much out of focus. So you can always get that shallow depth of field look, no matter what lens you have.
Just get closer to the subject, go as wide open as you can, that's the smallest number, and you will get that shallow depth of field.
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