Do my manual exposure settings (shutter speed and aperture) matter when taking a custom white balance while using strobes?
If photographing with strobes, then a difference in exposures between that used to custom white balance a camera, and the exposure used to photograph a subject MAY yield an incorrect result. As a rule of thumb, this would only happen when exposures slower than 1/125 of a second are used for either the custom white balance, or the subsequent shot of a subject. The reason for this is that exposures slower than 1/125 of a second begin to be influenced by the ambient light present in the shooting environment. The slower the exposure, the greater the influence the ambient light has on the resulting color of the image. Therefore, changing the exposure when shooting slower than 1/125 of a second changes the ratio of ambient light to artificial light, and this in turn changes the overall, average color temperature recorded in the custom white balance procedure. For this reason, when shooting using strobes, we recommend using the same manual exposure for your custom white balance that you will
