The Blue Crane Digital: BC543 Canon 5D MKIII In-Brief Camera Guide answers most camera operation questions quickly and easily. The information is arranged logically for ease of use. The reference card is laminated with foldable hinges so it lies flat and is easily stored in your camera bag. The first panel contains a color-coded index to the rest of the panels. For instance, if you have a question about white balance, just check the index and find your answer on the purple panel.