The preview screen can get you close to the correct exposure. The best way to judge exposure is to import the photo(s) into the computer and view them enlarged on the screen. It also makes it a lot easier in judging highlight and shadow detail and edge separation. The camera's histogram will not be particularly helpful if the photo is predominantly lighter or darker tones. The histogram from those types of photos will skew to one side or the other of the scale and can be confusing in analyzing the exposure. As the photographer gains experience with their camera and lights, they'll be able to use the preview image and histogram to better advantage.
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