I'm getting used to setting up "custom white balance" on my Minolta Maxxum 7D, using a "Camera Raw Gray Scale" card. My question: When I shoot a series, checking for proper exposure by using different f-stops and shutter speeds, should I use the "camera raw gray scale" card EVERY time I make a change? That seems logical, becuase changing from, for example, f3.5 to f11 drastically changes the amount of light entering the camera. Or...do I just set the custom white balance one time, and change all I want? thank you in advance
It seems to me that white balance has nothing to do with apertures and shutter speeds, ie., the amount of light; it deals only ith the color temperature of the light source that you are photograhing the subject in.
Set a custom WB for that source, save it into the memory and keep on shooting making adjustments in exposure according to the light levels that you encounter.