What is a diaphragm and why is it needed?

Every novice photographer, starting to learn photography equipment and how it works, encounters new words and https://www.artlook.us/service/gay-wedding-photographers-nyc/ for himself. So, for example, when he recognizes the word aperture, then of course the questions arise: “what is aperture, why is it needed, what it is responsible for and how it affects the picture?”

What is it and why is it needed?
The diaphragm in the lens is a device that consists of several lamella plates. That is, these are metal plates. By changing their position, they can block the hole in the lens. And accordingly, by changing the position of these shutters, we can adjust the amount of light that passes through the lens to the matrix. That is, the wider the aperture is open, there is more light, and if the aperture is covered, then there is less light.

What do the numbers on the lens mean?
Aperture is measured in F-values. F is the f-number. To calculate it, you need to divide the focal length of the lens by the effective aperture diameter. That is, if we have, for example, a 50mm lens and its aperture is fully open, for example, it is 1.4, then the effective diameter will be 50 millimeters divided by 1.4, that is, it will be 35mm. Aperture numbers form an aperture row.

Artistic background blur – bokeh
The aperture in the lens not only regulates the amount of light entering the photosensitive element (matrix / film), but is also an artistic tool. So when shooting at a wide open aperture, background blurring and the so-called bokeh effect appear.

Depth of field
DOF (Depth of field) – the zone in which objects in the frame look sharp is called the DOF zone. This is a very important factor in photography. After all, with the help of DOF, the photographer can focus on the subject. Most often, DOF can be seen in portrait photographs that were taken with a fast lens with a maximum aperture value of, for example, 1.8 or 1.4

In order to get a beautiful background blur, you need to remember a few patterns.

The longer the focal length of the lens, the narrower the depth of field zone
The wider the diaphragm is open (the smaller its value), the narrower the depth of field zone
The closer the camera is to the model, the more blurred the background will be.
The farther the background is from the model, the more blurry it will be.