Originally Posted by
Colin Robertson
Good Morning Ian.
Scenario 1- Imagine taking two incident readings. One in the area of full sun, the other in open shade. They'll be different by about 2 stops, and both are correct. Each reading is doing the job of placing your 18% grey on ZV for that degree of illumination. You have to decide what you want from that image. If the main interest is the shaded area, go with that. The highlights just might overexpose, but the latitude of film will probably save you. If the highlight area is more important go with that and accept lower shadow values. Or, split the difference; for years the majority of photographs were taken on cameras using reflective metering which averaged the scene.
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