Something I'm having trouble figuring out: I'm having trouble understanding why my camera (G2) takes it upon itself to adjust lighting/exposure/iris/whatever. O.k. In Manual. I adjust my shutter, aperture, and ISO to exactly what I want. Then I move to a different room, or near a window, and all of a sudden my camera compensates for the difference in light. I've been through every setting and I can't figure out why it's still doing this automatically (I have the auto ISO turned off). On a regular video camera, I'm able to use a manual mode to adjust my iris setting to what I want. And then when I pan across a window, the rest of the room does not go dark because my iris is locked. What am I missing here? Thanks!