Exposure locks when pressing shutter release halfway in evaluative metering mode

Started Jan 5, 2009 | Discussions thread
Doug Pardee
Doug Pardee Veteran Member • Posts: 8,879
Re: Exposure locks when pressing shutter release halfway in evaluative metering mode

Boldi wrote:

still cannot get the point of this behaviour (exposure locking in evaluative mode).
For me, it would make more sense not to lock it. Maybe my fault

Let's take an extreme example so that it's easier to follow.

You're taking a photograph of a person standing in front of a large picture window. The window is providing a rather strong backlighting.

You focus on the person and lock the focus, then recompose so that the AF point is over part of the window. You want the metering to be based on the person rather than on the window, right?

That's what the camera is doing. When you lock the focus, the camera locks the metering so that you're metering what's at the focus point at the time that you focused. If it didn't lock the metering when you locked the focus, the camera would be setting the exposure based on what's at the focus point after you've recomposed.

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