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igloo Registered since 16th May 2012
Sat 16-Jun-12 12:28 AM

Hi all,

I'm a bit confused the by exposure locking function. I wonder if anyone could enlighten me please?

As I understand it:

When I semi-press the shutter button, the camera starts 'metering', i.e. seeing how much light there is and setting the ISO, shutter speed and aperture (depending on the mode) appropriately. As this uses battery power, after a (configurable) amount of time it stops doing so.

Now, if I assign "AE lock (Hold)" to a button, then when I press that button the values of ISO, shutter speed and aperture will be frozen.

However, once metering stops, the exposure lock will end.

So what I don't understand is: Why is the camera still metering if the settings have been locked? And therefore, why can't they just remain locked indefinitely?