Adding depth of field in After Effects

we're going to look at adding a depth of field effect … to rendered footage from a 3D program. … Now, as we saw in the cinematography course, … the depth of field is the area of the frame that's in focus. … When our depth of field is shallow, … meaning objects in front of … and behind the subject are out of focus, … it makes a huge difference in the beauty of an image. … and this is the one that we're going to be using, … but you don't have what I'm about to do. … So, don't follow along with this. … I'm going to go in my project panel … and get these files from my computer. … This is a Photoshop sequence of this pass … from Cinema 4D that was rendered out with a depth of field. … I'm just going to go ahead and bring that in. … And so we have this kind of shallow depth of field … on our footage, and it looks more realistic … and believable with this blur here. … But here's the problem. … This render took 40 hours, … 40 hours with the depth of field. … And the shallow depth of field isn't even that great. …