set ting the RIGHT expo sure
A round-up of suggested camera settings for popular subjects
ALTHO UGH exposure is a flexible thing, there are optimum settings for specific
subjects. For example, landscape images typically require small apertures to get everything sharp from foreground to horizon. As you can see above, this can require a fairly slow shutter speed when the sensitivity is set to ISO 100. If you’re shooting without the aid of a tripod or image stabilised lenses, the exposure might be too slow to hold the camera steady and get sharp pictures, in which case you can increase the ISO.
At the other extreme, photographing active wildlife, particularly birds in flight, can require very fast shutter speeds. At ISO 100, this might result in having to use the maximum (widest) aperture on the lens. The maximum aperture on your lens might not be wide enough to achieve the necessary shutter speed, in which case you’ll need to increase the ISO. One thing to bear in mind is that you’ll make adjustments in EV values, or stops: if you increase one of the three exposure controls by one stop (taking ISO from 100 to 200, say), you need to decrease one of the other controls (shutter speed or aperture in our case) by one stop – or a combination of both, as long as it adds up to one full stop – in order to maintain the same overall level of exposure.