Exposure locks when pressing shutter halfway in evaluative metering mode

Started Jan 5, 2009 | Discussions thread
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Boldi
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Exposure locks when pressing shutter halfway in evaluative metering mode
Jan 5, 2009

Hello,

I have a problem with my Canon EOS 400D/Rebel XTi camera. I use Av mode most of the time and realised that in evaluative metering mode the camera locks the exposure value (exposure time) when I press the shutter release button halfway to fix the focus. This is problem, because 99% I recompose the picture after locking the focus and the lighting changes with turning the camera. I suppose the * button should only fix the exposure. With other metering modes (center weighted and partial) the exposure is not locked and the exposure time changes by recomposing the image.

I made a little survey amongst my friends having Canon cameras, and it turned out that some cameras lock the exposure time in evaluative mode while others not.

In Custome Functions the setting for the shutter release button/* button is set to 0 (default) all the time in all the examined cameras.

So it seems that this behaviour depends on the camera type/firmware.
Is this a bug or what?

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