What is the aperture in a DSLR
Filming with DSLR - 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.
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