Back in the days of film, where there were no image previews and every frame cost money to take, light meters allowed you to ensure that an image would be properly lit and the results would be what you expected. With digital, you can now check the results instantly and make adjustments right away with no penalty. So, while light meters are not necessary anymore, they can still be quite useful. This great video tutorial will show you how to use one properly.
[ Read More ](Originally posted by Alex Cooke)