A basic guide to handheld light meters in photography.
Before I get into the whys of using one, let’s take a look at what exactly a handheld light meter is.
No matter how the information is displayed, most photographic light meters will provide you with the same basic information. By measuring the available light, the meter will provide the correct aperture/f-stop combination for a given scene. One is that reflected light will vary in intensity based on the subject . For instance, someone with dark skin is going to reflect less light than a person that is fair-skinned. The result can be that the camera meter will over-expose the dark skin and will underexpose for the light skin.The second factor is that evaluative, in-camera processing of the light readings is making the best guess based on the scene or subject.
By using an incident reading, you will know exactly how much light is coming from your light source. By using this exposure value for all the headshots, everyone will be properly exposed even if the subjects have wide differences in skin tones from each other . The same applies to any situation where you are using lights that are set to a fixed outputthe subject is placed the same distance from the light source from shot to shot.
This situation is the reason I first decided I needed a handheld meter back in the late 1980s. In particular, I needed one that could read flash for use with studio strobes. Without a meter, I would be forced to guess the correct f-stop when using my studio lights.
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