On 11/16/2011 6:33 PM, Christine Nielsen wrote: !
I've never really used the green button... (shocking, but true!) I'll admit, I'm not really even sure what it does...(gasp!) Maybe I'll RTFM tomorrow on that. :)
You must trust auto exposure far more than I do. My standard mode of shooting is to put the camera in manual, and set the exposure for the scene, rather than leaving it in auto and letting random highlights screw up the exposure if I slightly recompose the shot.
I have my camera set up so that the thumbwheel controls aperture, the front wheel controls shutter speed, and the thumbwheel + ISO button controls ISO. That part is standard. I have the green button set up to set the shutter speed, leaving the aperture and ISO as they are (Av mode). There are other options, Tv mode, and quite possibly P and optimize MTF.
When setting up for a scene, I'll hit the green button, check the resulting settings, making sure that they are reasonable (i.e. not 1/10 Second if I'm shooting action), take a test shot, chimp the histogram, and once I get it dialed in, I find I can generally leave it as is until I move to different lighting.
One thing that the green button is awesome for is shooting with old manual lenses. Set the aperture on the lens, press the green button, the camera stops down and sets the shutter speed. It's damn near like having auto exposure on manual exposure lenses, truly a thing of beauty.
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