This tutorial is about fill cards and why photographers use them. It starts off be explaining the differences between how the human eye works and sees thing versus how a len’s aperture works and how the camera sees things. It goes on to illustrate how the placement of a single fill card can alter the look of a resulting image when a fill card is used.
Next, it describes a way to construct a simple fixture that will allow photographers to position a fill card exactly where they want it quickly and easily. With that out of the way, offers three specific and different ways to use fill cards. These include changing a fill card to a primary light source that drastically affects the catch lights reflected in the subject, surrounding a subject with fill cards, and finally how not using a fill card, changing the color of a fill card, reflecting a light source in a subject, compared to using a more traditional fill card affect how that subject is rendered in the final image.