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For most situations, auto white balance is going to be your white balance of choice. The auto white balance mechanism on the Mark III is very good. However, if you're taking some shots with auto white balance, and you're noticing on the back of the screen that maybe the white balance is a little off, that your colors look a little strange, you can change to a different white balance. So, to change white balance, I press the white balance button, and now I've got the option to change white balance, and metering mode. But of course, because white balance is on the right side of the little dot, it's the rear dial.
So I can cycle through these by turning the command dial back here. From auto white balance, I get daylight, shade, cloudy, incandescent or tungsten, fluorescent, flash, a manual white balance setting, which we'll look at in a separate movie, and the option to dial in a specific white balance in degrees Kelvin, and then it cycles back to auto white balance. So let's say that I'm outside shooting in shade, and I take some pictures with auto white balance, and I am shooting a person, and I notice their skin just looks a little cold.
I could simply press this button, and drop down here to shade. In my experience, auto white balance on the Mark III really does a great job in pretty much all situations, except for shade, or maybe on a cloudy day, and I've got two different settings there: shade, and cloud. They are slightly different. Which one is going to be right for your situation is just something you are going to have to experiment with. Now, there are some other ways to change white balance. From the camera's menuing system, I can go here to the second shooting page, and there's a white balance entry; it shows where I'm currently set, and now I've got all of my different options arrayed here.
And I can cycle through them with the command dial, and actually get a label of what they are. So if you forget what the icons are, this is a way of getting a little feedback while you're selecting white balance. Now, white balance is measured in degrees Kelvin, and one thing that's nice about this display is it tells me the actual color temperature that's being dialed in by each of these settings. If I want, if I know the exact color temperature of the lights that I am using in degrees Kelvin, I can come over here to the K setting, and change the temperature specifically with the main dial up here, so I can dial in a very particular temperature.
When I get all of this configured the way that I want, I hit the Set button, and drop back out, and now you can see it's automatically changed me over to K, and that's going to be K at the temperature setting that I specified. Now, you want to be careful about judging color on the LCD screen. You don't want to get too picky about the colors that you're seeing, but the color on the LCD screen is good enough to judge a bad white balance, so keep an eye on that while you're shooting. Over time, you're going to get more experience into when you should change out of auto white balance, and when you should use a white balance preset.
One way to avoid this entire issue is simply to shoot RAW, because in RAW mode, you can change white balance after the fact. Even as a RAW shooter, though, it's a good idea to get white balance set correctly in camera, because it's going to save you a lot of post-processing time later.
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