We’ve already discussed how the focal length of a lens affects field of view. A 24mm lens will see a wider angle of view than a 70mm lens. However, there is another factor that affects angle of view – the size of the sensor inside of the camera being used.
A camera lens is primarily defined by three qualities: its focal length (or focal range), maximum aperture (or maximum aperture range), and mount.
We should spend some time defining the terms that we’re going to be using.
Before we get into the specifics of the many different cameras in our collection, I’d like to spend some time going over how cameras work in general. After all, learning how to set something like the shutter speed or ISO on a camera doesn’t do much good if you don’t understand what changing those settings actually does to your image.