Panasonic DMC-LX7K Owner's Manual page 88

Application (Record)
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About aperture value
To record motion pictures with a sharp focus on both subject and background, set
the aperture value to a higher number. To record motion pictures with a defocused
background, set a lower number.
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About the shutter speed
To record a sharp motion picture of a fast-moving subject, set a faster shutter speed.
To record a motion picture with a trailing effect for a subject's movements, set a slower
shutter speed.
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Press the shutter button to start and stop recording motion pictures.
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Still pictures cannot be recorded while motion pictures are being recorded.
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The shutter speed that can be set using [Creative Video Mode] is different from the
values that can be set using [Program AE], [Aperture-Priority], [Shutter-Priority], and
[Manual Exposure] Modes.
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Although you can change camera settings such as shutter speed and aperture value
even when a motion picture recording is in progress, the beeps and camera operation
sounds may be recorded in some cases.
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When you set a faster shutter speed, the screen noise may increase due to the higher
sensitivity.
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When you take a picture under a fluorescent lamp, LED, mercury arc lamp or sodium
lamp, for example, the coloring and the brightness of the screen may change.
Recording motion pictures with manual operation [Creative Video Mode]
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