Originally Posted by R_Fredrick_Smith
It may depend on the camera, but the gray part of the target must totally fill the center portion of the viewfinder. I never use the target the way you're showing it in the photo for WB settings. I fill the frame with the target (the whole viewfinder). This more or less guarantees that the gray part will completely cover the central metering circle. I also find that it is wise to have the proper exposure for the target. The shot you show is not properly exposed. Here is the histogram of your target
As you can see there are only two spikes, the third is missing. The basic way you use the target is first get the exposure zeroed in by getting three good spikes, and then use that final target shot for your CWB. In all cases, always fill the entire viewfinder with the target.
Thank you RFS!
I am using a Canon 20D. I tend to use my Sekonic light meter for exposure setting. They (target and light meter methods) should agree, so I am sure what happened here.
Here's another shot taken within five minutes of the target shot. Same exposure settings. It does look a tad bright. In fact, in Photoshop, I would reduce the exposure by about 0.75 to 1 É stop. Still not sure what happened with the light meter.
Okay, so if I understand your steps correctly, get the histogram (exposure) set first, and then fill the frame (move closer if required) to set white balance.
Thank you very much for your assistance.
Here's the same picture again, with one less É stop of exposure and some color correction.