Exposure lock

- If you're shooting a subject…but you want to recompose the frame,…you can use the Auto Exposure Lock…command to lock the exposure.…This is particularly useful when shooting things…like a portrait or a panoramic photo…so you don't have changes in the frame as the camera moves.…The lock button is going to allow you to meter the scene,…and then when you press and hold it,…it will lock those values in.…Let me show you how this works.…First up, let's go ahead and set the metering mode…to something smaller, like a spot.…

Now what you'll notice is that…we have a small target there in the middle of the frame.…Let's go ahead and pan up here, for example,…and what I'm going to do is meter on the background…and then hold the exposure lock down.…Now when I pan down into the frame,…even when I put it into the dark areas,…you notice that the exposure is locked into place.…On the other hand, if I release that, it quickly changes.…Conversely, let's say we place that…right on our dark subjects there to meter,…and I press and hold the exposure lock button.…