BLACK CAT PhotoProducts, Inc.

Select the desired Scene letter (realm) in the first column, then choose your ISO, shutter speed, and aperture. Add the code numbers in each of the four columns. The total must be 50 for a proper exposure. See the example at the dashed line where the Scene letter (realm) is "B".
Note that the columns will "slide" up and down, depending on what selections are made.
Use of this chart eliminates the need for the dial on the Black Cat Extended Range Exposure Guide as a decoder for the Universal Light Code (ULC).

Jim Lehman's Exposure Tetrad Chart is copyrighted. The chart is for personal use only and may be used for commercial applications only with written permission from the author.