Photography has a lot of confusing terminology, and often there are several ways to describe the same idea. One of the more annoying ones is when lenses are called “fast”. How can a lens have a speed? If you drop two lenses, they’ll both hit the ground (and break) at the same time.
It’s an old term, so let’s find out.If you recall, the two basic things you have control over when you’re taking a photo are the shutter speed your camera uses and the aperture of the lens. The shutter speed is measured in seconds or fractions of a second while aperture is measured in f-stops.
The wider the aperture of the lens is open, the faster the shutter speed needs…
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