olrac wrote:But if I read your post correctly you set your wb shoot with an eye on changing conditions eg cloud covers the sun....
Yes.
This also holds true for exposure. If you're shooting in a studio using studio flash, for instance, you're shooting under fixed lighting conditions.
And, if you're shooting outdoors in a park, in bright sunshine, while ever the sun is shining brightly, those lighting conditions, too, are fixed.
And if the conditions change and a big cloud comes over and parks itself in the sky giving you some ideal lighting conditions that will be fixed while ever that cloud remains parked there ....
Each of those setups will demand a different set of exposure values from each of the others, but within each of them, the exposure settings - the amount and colour of the light - should not be changing, and thus you should be able to set and forget your wb and work with a set EV.
Don't confuse working with a set EV though with making different exposure settings - your creative senses and desire to make the best of each of each image should still dictate the actual aperture/shutter speed combinations that you'll be using, but those settings will always be guided by the available EV.