I am just starting to learn to use my new Nikon D70. I have been reading about white balance, and I have a question. Now be honest, how many of you adjust the white balance before you shoot? I realize it would be necessary if shooting under florescent lights, mercury vapor lights, etc. But my question is how many of you change the white balance from the bright sunlight setting to the cloudy setting? Is it really necessary? Has anyone had any experience with this?