I went on a slide bender today to get some of the fall colors on film. I was shooting a slow film (Provia 100F) under overcast skies, under the canopy. The camera was giving me exposure times around a second at f/22 (going for the blur on the one waterfall that was flowing because it's been so dry here). Far from simple full sun. I relied on my camera's meter. I'll find out when I get the slides back from the lab whether it metered okay. Chances are, it did.