Ok, so I read all these guides about how to work a 35mm SLR camera, which I now own. Everything I read about it says that you can get equivalent exposures from doubling aperature and halving shutter speed, smaller aperature = greater DOF, stuff like that. The problem is, I have no solid bench marks. I know how to change settings, but I don't know the starting point from which to change them, if that makes any sense. Here's my specific scenario: I want to take landscape shots today. The sky is overcast, there is a TON of snow, I have a tripod, and I have ISO 100 film. So, what settings should I use for fstop and shutter speed to get the crispest shots? The lense goes up to f22.