Canon manual 70

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cate an exposure adjustment of only 1/3 f/stop, but your picture will be exposed in the 1/3 f/stop increment you set on the dial.

Generally, exposure should be corrected whenever the high-key (light) or low-key area occupies more than half of the total viewing area. How much more or less exposure should be given depends on the lighting condition as roughly described below. However, these are only general guidelines meant to help you while experimenting.

Some situations require special measures. For instance, when shooting a subject against the sun or some other exceptionally strong light source, requiring drastic exposure correction, or when you shoot a subject in an unvarying lighting condition such as under photo lamps in a studio, it

Scale	Exposure Correction	Application
1/4	2 f/stops underexposure	Black background
:		Spot lighting
1/2	1 f/stop underexposure	Black background occupying half of viewing area
:
1	Normal
:		Overhead interior lighting
2	1 f/stop overexposure	Subject by a window
:		Blue sky or sea backgrounds occupying half of viewing area
		Contre-jour portrait, white background, snow scene or blue
4	2 f/stops overexposure
		sky background .

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