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By default the function button on the front of your camera doesn't do anything, but it's in a great location. When your hand is on the hand grip, you've got easy access to the top button for Depth of Field Preview by default, and this bottom button here, which you can add another function to. To set that function you want to go here into your menu, into the Custom Setting menu, down to the Controls category, and you're looking for f4 Assigned function button. If I come in here, you can see that it defaults to off, and again, the camera is highlighting it for me, just in case you ever get confused as about where it is.
And when you come in here, you're actually going to be looking at the bottom of a very long list of functions. You may think at first, well, there are only three things I can do. That's not true. There's this really long list of things that you can define for the function button. I'm just going to go through this quickly and call out a couple of the cool ones. I could of course move Depth of Field Preview button to the lower button. If you find that that's easier for you to reach, you may want to do that. Flash Value lock, that locks my exposure value. I've got all sorts of different auto exposure locks that I can dial in here. You can find out more about those and what they do starting on page 311 of your manual.
I can set this button to Start Autofocus, if I want to separate Autofocus from the Shutter button. I can set it to turn the flash off. This is a cool feature. If I've got an autobracket set, I can hold in the Function button, press the Shutter button once and it will automatically take all the shots needed for my bracket. So that's one shutter button pressed to get my seven-shot bracket taken care of. I can set it so that the Function button temporarily turns on any of these metering modes. So let's say that I normally stay in Matrix metering, which is pretty much the best metering mode for general-purpose use, but that I occasionally want Spot metering.
Rather than having to change to a different metering mode, I can simply press and hold the Function button and have a temporary spot meter. I can use it to jump into Playback mode. If I have built a custom menu, I can set it to automatically access that top item. So let's say that I've set the top item in My Menu to be format, because that's something I do pretty regularly. This would be a very speedy way to get there. Perhaps you're a JPEG shooter, but you occasionally run into situations where you think I'm going to need a RAW file here.
You can assign it so that when you press the Function button it temporarily adds raw to your format choice here, so you'll still get your JPEG shot, plus a raw file. Press it again, it will turn off the raw file. Or I can have it turn on my virtual horizon here in my viewfinder. So there are lots of really useful things that you can assign to this button, and thanks to its position, you can get really easy access to these different functions.
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