Want to Learn the Science of Exposure & Metering? Filmmaker IQ Will Help!

Learning is all boring and hard. Well, it can be if the information is overly technical and not interesting. That's what makes the FILMMAKER IQ videos so great. They break down how science or techniques work in a clear and succinct way that ensures you're gaining knowledge.

John Hess's video is there to help you break down the Science behind exposure and metering, and I mean break down. The video is more than a crash course on how cameras work it starts at the beginning, explaining that optimum exposure will render a middle grey object as... middle grey.

John then starts to break down light, what is a candela? What is a foot-candle? This leads to Lumens.


This method of teaching is how most schools should break down technical things. If you just told someone the light meter on your camera measured light to give you optimum exposure to whatever you have selected, it would be right. But it wouldn't help you understand what is actually happening. The benefit here as a photographer is that if you understand how light works, how it radiates and is measured, you can take better advantage of it.

If you're using the meter built into your camera, which is called spot metering, the camera is taking into account what happens to light as it passes through an ND filter, lenses and maybe a shutter before it hits the sensor. It's based on the light it's receiving not the light that the subject is receiving.

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He does a great job explaining how a camera or light meter computes the Exposure Value of a subject when it's spot metered, here.

This video can be a bit overwhelming at times as each important item is explained, from shutter speed to film or sensor speed to pixels to crazy math, but if you interested in how it all works, check it out now.