On the Canon EOS 450D (Rebel XSi) camera, Liveview mode always shows the true exposure of the image. If exposure is set too dark (fast shutter and closed aperture), Liveview shows a darker image. If exposure is set too bright (slow shutter and open aperture), Liveview shows a brighter image.

However some cameras do have an option to select whether the camera should always show a truly exposed image or, otherwise, always how a normally exposed image.

How do I switch my 450D to the second behavior?

  • This may be possible using Magic Lantern firmware, but I don't have enough experience with it to be able to include this in my answer. – NickM Mar 8 '15 at 20:00

According to the manual (specifically, page 96) this is not possible with the Canon EOS 450D. However on page 97 there is this information:

If the [Custom Functions (C.Fn)]’s menu [Auto Lighting Optimizer] (p.156) is set to [0: Enable], a darkly-exposed (set with exposure compensation) image may be displayed brighter.

This might help where your exposure settings result in a too-dark image on the screen, though from the description only in certain conditions (i.e. when using exposure compensation). I don't know whether it will help with overexposed images.

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