paddler4 wrote in post #16437600
The only method I have seen for UniWB was extremely complicated. What is the simple black-frame method? If it is really simple, I would be tempted to try it. I have a 5dMkIII but do not have Magic Lantern. What I do know to make the histogram reasonable is to select the neutral style and turn contrast down by 2. (I shoot only raw.)
Just shoot a photo with the lens cap on. Use a reasonably fast shutter speed and ISO 100 to minimize noise. Then do the normal procedure for making a Custom WB. When the camera asks if you want to use the black shot, say yes. The camera will then answer back, "You idiot, that's not a good shot. Are you sure?" but you should be strong and insist that you know what you are doing. (Show a sign of weakness and the camera will control you for the rest of your life.)
The theory is that when the camera makes a CWB it inspects the shot you made of a grey card or whatever and if it sees a bluish card it makes a reddish CWB to compensate. When it examines the black shot it sees 0/0/0 and thinks, "Sheeyit, this mother's already balanced. All I have to do is make a CWB where everything is 1.