I have three questions about shooting manual (e.g. for weddings inside a church). First is process - do you tune your manual settings from AV? And if so, what do you set next (speed, ISO?).
Posters generally comment that shooting in manual provides for greater image consistency - but I find light conditions can change quite quickly (e.g. with bright light slanting in from windows but a couple of paces foward, the light is considerably less as the window light disappears). With AV, the camera automatically adjusts; but if you are shooting in manual, will not the significant light changes produce over- and under-exposed images?
Lastly, if you meter and then set your camera to the manual settings of choice, what metering mode do you use to ensure the best settings (e.g. evaluative would seem to compensate the best for variable light readings)?