Canon EOS 50D - Manual (Page 129)

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Notes about the Live View image
Under low light or bright light conditions, the Live View image might not
reflect the brightness of the captured image.
If the light source within the image changes, the screen might flicker. If
this happens, stop and resume the Live View shooting under the actual
light source to be used.
If you point the camera in a different direction, it might throw off the Live
View image’s correct brightness momentarily. Wait until the brightness
level stabilizes before shooting.
If there is a very bright light source in the picture, such as the sun, the
bright area might appear black on the LCD monitor. However, the actual
captured image will correctly show the bright area.
In low light, if you set the [6 LCD brightness] to a bright setting,
chrominance noise may appear in the Live View image. However, the
chrominance noise will not be recorded in the captured image.
When you magnify the image, the image sharpness may look more
pronounced than it really is.
Notes about the shooting results
When you use Live View shooting for a long period, the camera’s internal
temperature may increase and it can degrade image quality. Terminate
Live View shooting when not shooting images. Before taking a long
exposure, stop Live View shooting temporarily and wait several minutes
before shooting.
High temperatures, high ISO speeds, or long exposures may cause
noise or irregular colors in the image captured with Live View shooting.
If you take the picture while the image is magnified, the exposure might
not come out as desired. Return to the normal view before taking the
picture. During the magnified view, the shutter speed and aperture will be
displayed in red.
Even if you take the picture during magnified view, the captured image
will show the normal view.
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