Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member
One of the great advantages of digital cameras over film is that you can change the ISO on your camera from shot to shot. As you increase ISO, the image sensor in your camera becomes more sensitive to light, which means you can use faster shutter speeds, and smaller apertures. Now, you'll most often increase ISO when light levels drop low enough that your shutter speeds go too low for handheld shooting, but you might also increase ISO if you want to use smaller apertures to capture deeper depth of field.
If you're not clear on when and how to effectively use ISO, check out my Foundations of Photography: Exposure course. Setting ISO on the Mark III is very easy. This is the ISO button right here. It's also the flash exposure compensation button. Most importantly, it's a different shape from the other buttons. It's concave instead of convex, and it's bigger than the back screen light button over here. The reason I say that's important is that if I'm looking through the viewfinder, and I've got my hand on the camera grip, and my finger on the shutter button, I can simply come straight back, and find the ISO button, because it feels different than these two.
Again, it's recessed, and it's got that little bump right in the middle. What that means is it's very easy for me to find the ISO control without taking my eye off of the viewfinder. That means I can change ISO without having to pull my face away from the camera, and lose my framing, and all that kind of stuff. So to set ISO, I just press the ISO button, and then turn the main dial here, and that bumps me up or down. I'm currently set to change ISO in one-third stop increments. I can change that, as we'll see later, to full stop increments, and I can simply dial in whatever I want.
Now, the ISO readout that I'm seeing here is also reflected inside the viewfinder, so still, I don't have to take my eye off the viewfinder. There's nothing to press to confirm that ISO choice, I simply press the button, and dial it to wherever I want, and then it either times out and goes back to the normal display, or a half-press of the shutter button gets me back into shooting. So I don't have to press any kind of confirmation to set ISO. So, this is a control you're going to be using a lot. ISO is your third exposure parameter, it's a critical exposure parameter, so it's really nice that the Mark III makes it so easy to change.
Get unlimited access to all courses for just $25/month.Become a member
164 Video lessons · 45003 Viewers
64 Video lessons · 82991 Viewers
86 Video lessons · 53207 Viewers
148 Video lessons · 90198 Viewers