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There will be times where you'll want to shoot multiple frames, with different compositions, but use the same exposure settings for each shot. Panoramas are the most common situation where you'll encounter this problem. The exposure lock control lets you meter a scene, and then lock that exposure in as you take multiple shots. Exposure lock on the Mark III is very simple. First of all, you need an exposure to lock, so I'm going to just half-press the shutter button, I'm here at a 125th at f/4. The exposure lock is this button right here under my thumb; the one with the asterisk on it.
If I meter, and then press that, inside the viewfinder, I'll see the asterisk appear over on the right-hand side. That means, as long as I'm metered, my metering will hold from shot to shot. So now, after I've metered, and locked, no matter where I turn the camera, no matter how the lighting in my scene changes, no matter how the subject matter in my scene changes, the camera will still use that same exposure. Now, after a while, this will time out, just like the normal metering does, so when you're done shooting your exposure lock stuff, you may need to wait a little bit for the lock to wear off.
The default is eight seconds, but it is possible to change that later if you find that's too long. Exposure lock can also be a critical tool when shooting in aperture or shutter priority mode, as we'll see later.
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