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The term ‘stop’ is used for referring to exposure. If you step up one stop you will halve the exposure, while if you step down you will double it. For instance, by moving the shutter speed up from 1/125 second to 1/250 second the exposure has halved (–1 stop). Moving down from 1/125 second to 1/60 second doubles the exposure (+1 stop). The same also applies to the aperture and ISO settings.

Your camera gives you the option of moving between stops in fractions of ⅓ or ½ of a stop. You will probably find that setting the camera to ½ step between the stops makes it a bit less confusing when using the shutter, aperture and ISO dials since it relates more easily to the doubling or halving effect of a whole stop.

LOW KEY

Traditionally used for masculine subjects to make a dark, moody interpretation, the low-key effect can be applied to many subjects. In this case the backlight encouraged me to underexpose the picture to get a dark, romantic feel, letting the backlight be used only to separate the lovers from the background. I used a 500mm mirror lens, which has made ‘doughnut rings’ out of the background highlights. I exposed for the highlights here, letting the shadows underexpose by –2 stops. 1/1000 second at f8, 500mm, 400 ISO. JG