Panasonic Lumix DMC-ZS40 Operating Instructions Manual page 109

Application (Record)
Taking pictures by setting the aperture value and shutter speed [Manual Exposure] Mode
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Manual exposure assist (estimate)
Shows pictures with standard brightness (appropriate exposure).
Shows brighter pictures. For the appropriate exposure, either use a faster shutter
speed or increase aperture value.
Shows darker pictures. For the appropriate exposure, either use a slower shutter
speed or reduce aperture value.
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When the picture is too bright or too dark or there is incorrect exposure, the numbers
for the aperture value and shutter speed are shown in red.
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LCD monitor or viewfinder brightness may vary from the actual still picture recorded.
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