Currently, DSLR cameras have many automatic scene modes and settings that the user can change with a simple press of a button. But in order to get a really good picture, you need to be able to use the existing photographic equipment.
The lens diaphragm is a partition consisting of thin hemispheres (petals) that allows you to adjust the lens opening through which the light beams pass. The diaphragm serves to establish a given image sharpness and light transmission.
Aperture has f-values that determine how wide the hemispheres open. The scale of values varies from f / 0, 7 to f / 64 and the lower the aperture value, the more the petals open, which means more light penetrates the sensitive sensor. When we press the release button, the petals open up and form a hole through which light passes. It can also be noted that the aperture determines the sharpness of the picture: the larger the aperture created by the petals, the more blurry out-of-focus objects (in the background) will appear. And if you hold down the aperture harder, then the objects in the photo will turn out to be sharp.
The aperture setting on SLR cameras differs significantly from each other, it is better to carry out it in manual (mechanical) mode. It should also be borne in mind that its optimal values are in the range of f / 5, 6 - f / 11. If there is a lack of light, it is better to set aperture values of -1, 4-2, 8. For portraits - f / 2, 8-f / 5, 6. It is better to set a lower value when you need to strongly blur the background. The f / 8-f / 11 values are good for taking group portraits, the larger values make it possible to capture landscapes well when there is no need to isolate any one subject.
The photographer adjusts his device as it is convenient for him, it is necessary to constantly experiment and select settings. You need to try photographing the same subject with different settings and then determine the optimal value for your lens in order to get quality photos later.
