3 Reasons Why You Should Switch To Back Button Focus. How to read a histogram: photography cheat sheet. Most photographers know that you can check the exposure of the shots you’ve taken simply by reviewing them on your camera’s LCD screen.
But looking at the picture alone can be misleading. Knowing how to read your camera’s histogram is the most important thing you can do to ensure a good exposure. Your camera gives you the option to show the range of brightness in your image as a graph, which plots the light levels from jet black, on the left, to pure white, on the right. Online Depth of Field Calculator.