What is the aperture in a DSLR

Filming with DSLR - The aperture

What is the aperture

The aperture is one of the most important design elements of the photographer. It indicates the size of the opening through which the light falls on the sensor. A small aperture value (e.g. "2.8") corresponds to a large aperture. This means that a lot of light falls on the sensor and the image becomes brighter. A large aperture value (e.g. "22") corresponds to a small opening, so that little light falls on the sensor and the image becomes darker.

With little light you choose a small aperture value (= large aperture).

The f-stops that are possible depend on the lens. Large aperture lenses can be very expensive. Most lenses offer the largest possible aperture values ​​between 5.6 and 1.8.

What speaks against a large aperture?

In the case of a large aperture, the so-called depth of field decreases. Objects that are in focus are then in focus, but everything just in front of or behind it becomes very out of focus. With a small aperture, on the other hand, objects remain sharp in front of or behind this point.

A shallow depth of field doesn't have to be bad, however: When taking portraits, you want to blur the background and choose a large aperture (small aperture value!).

And another criterion for choosing the aperture: Most lenses produce the best image quality at medium apertures.