Photovision 24" Digital Calibration Target, Collapsible Disc Exposure Aid for Digital Cameras.

• Loss of Highlight or Shadow detail is reduced or eliminated by the use of this 24" Digital Target which has black, white & 18 % gray panels that feedback through the camera's histogram providing correct exposure with predictable results.
• Created by photographer Ed Pierce, Westcott now offers a collapsible version, perfect for the Digital Image Maker both in the studio or on the go.
• The Panel feeds back through the camera's Histogram. Rather than using a single middle tonal value, you can customize your exposure based on the histogram spikes that record the highlight & shadows.