The White Balance Card Set from Vello provides an 18% gray card along with white and black reference cards. With your digital camera, the gray card helps you to determine accurate exposures, the white card achieves the optimal color balance under any lighting situation, and the black card can be used as a reference point when editing your images in a post-production software. Also, the included lanyard helps to manage your cards while using them.
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Got a papercut the moment I pulled these out of the packaging. The edges are unfinished and dangerously sharp. Might be fine for a one off under controlled conditions, but these are totally useless for my location use when I'm rushing around and a simple paper cut can causes delays and impact my work.
Great balance cards are useful for color correction. The white card works well for on-camera white balance correction, while the grey card is helpful for post-production work. I'm not sure how others use the black card, but it may also help expedite post-production processes by getting you true blacks.