Ham, I started to use a grey card and it really helps. I just shoot my first pic with it somewhere in the frame, then remove it and re-shoot. If the light changes, I re-shoot it. Then is post, I just click the white balance eye dropper on it and viola!

I just received a X-Rite Color Checker and ColorMunki bundle.... as I noted above, I calibrated my monitor with the ColorMunki but have not used the Color Checker.... I suspect it will do the same as a simple grey card but it is supposed to be integrated well with LightRoom, which I use. Will use it this weekend at my niece's wedding. Besides, I like gadgets.

Bruce
www.TravelThroughPictures.com