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Old May 12th 17, 07:30 PM posted to rec.photo.digital,alt.photography
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Default A New Tool For Photographers

In article , Alfred
Molon wrote:

However,
there are times when the camera metering will fail you, or there is
little choice but to go full manual and the assistance of a good
incident/spot light is going to be invaluable. Consider shooting in a
studio with variable artificial lighting, or outdoors using ND filters.


Not sure I understand why you would need an external metering device in
such cases. Can't you just take the shot and if it comes over- or
underexposed, simply adjust the exposure and retake the shot?


a lot of times, there is no retaking the shot.