Achieving Perfect Exposures in Digital and Film Photography 281
Figure 15-7 18% refl ectance scene. Since practically all colors and shades within the scene are
of average brightness, a reading with any built-in CentreWeighted or CentreSpot metering
system should provide perfect exposures. (Photo by Ernst Wildi.)
the shade. You have to compromise in some cases. For example, if an 18% green grass area in
sunlight is a relatively small part of a composition where most other areas, and perhaps more
important areas, are somewhat shaded, you may want to increase exposure to have more
details in the darker areas even though the green grass area may by somewhat overexposed.
This may sound rather complicated, but let me point out that this subject and light evalu-
ation is not a characteristic of a refl ective or built-in metering mode. The same evaluation
must be made with an incident meter. With an incident meter you must also evaluate what
amount of light that falls on different areas within the composition and then decide whether
shaded or lighted areas are more important and then make the meter reading accordingly.
In this subject evaluation, camera metering systems have a defi nite advantage because
the metered area is accurately outlined on the focusing screen and you can see the measured
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