Metering
Generally speaking, metering is main in the face, or even more stringent in the eyes for portrait photography. Use central focus or spot metering, the metering point of the viewfinder screen move to the face, good measure to the proper composition of light and then press the shutter.
Aperture
Portrait photography, I use a large aperture, in order to achieve shallow depth of field. Ratio is not great in the main case would be more prominent. Another advantage of using large aperture, the weather conditions than the dark, the shutter speed slower than the safety limit .
Shutter speed
What is the safety margin of shutter speed ? It is a “critical value” , faster than this limit .
It can be removed blurred caused by hand-shaking or the subject's movement , so the safety of the shutter varies the people.
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