50mm Lens

Aperture – Defined

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Aperture is a variable size opening in the lens, through which light enters the camera.

Aperture numbers indicate the amount the aperture blades are closing. This is sometimes confusing for people since a small aperture number means a larger aperture opening.
Aperture numbers are measured in stops, and are as follows: f/1.0 f/1.4 f/2 f/2.8 f/4 f/5.6 f/8 f/11 f/16 f/22 f/32 f/45 f/64

The smaller numbers, f/1.0 through f/2.8 tells us the blades are barely closed. These apertures are generally what you want to use for portraits.

f/2.8
Approximation of blade position at f/2.8

A medium number, such as f/8 through f16, has the blades closed down a bit. This is usually the sharpest range of a lens for capturing an entire scene like landscapes.

f/11
Approximation of blade position when closed to f/11

The larger numbers; f/32 through f/64, tells us the blades are nearly completely closed. The only use for this is to have a longer shutter speed. This could be used for shooting waterfalls, or any shot to show motion blur.

50mm Lens
This is a 50mm lens with the aperture wide open a f/1.8

© Ichtor | Dreamstime Stock Photos

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