Something that works for me: I tend to regard the DOV setting on the bryce camera as the kind of zoom lens you'd get on a real-world camera. My usual method is to physically place the camera object into the approximate location on the model that I want to "shoot" from, and then ajust the DOV setting until I have my shot "framed" properly. Thinging of the bryce worldspace as a little minature movie set, and anything placed into it as a set or a piece of scenery really helps with the thinking (at least for me) on setting lights and cameras.