What is a diaphragm

I think most people have heard this word. But many beginner photographers do not know what aperture is and do not understand what it is responsible for when taking photos.
What is a diaphragm
Diaphragm in Greek means “partition”, and in English it sounds like Aperture. In simple terms, the diaphragm is the opening of any lens in the form of overlapping blades. The number of blades can vary.

The aperture is responsible for the depth of field

Or, in other words, for the depth of sharply depicted space (abbreviated DOF). And also for the aperture ratio of the lens (that is, the amount of light coming through the lens to the camera matrix.

To put it even more simply, the diaphragm can be compared to the eye of a person or an animal. Pay attention to the pupil when you look at the sun. What happens to it? In the sun, the pupil narrows so as not to damage the retina with bright light. In the dark, on the contrary, the pupil expands so that more light falls on the retina. This is especially visible in nocturnal animals. Their pupils are very large. The diaphragm in a camera is responsible for the same functions.

That is, the worse the lighting conditions during photography, the wider the aperture needs to be opened. And in good lighting conditions (for example, on a bright sunny day), the aperture can be clamped.

Now let’s look at the digital aperture values.
On the camera display, aperture values ghana phone number library ​​are indicated by the English letter F. The main thing to remember is that the smaller the aperture number F, the wider the physical aperture opening.

If I go a little deeper into the explanations, I can tell you why the aperture is designated by these numbers. And why small aperture values ​​indicate a large opening, and large numbers indicate a small aperture opening.

Let’s take for example a lens with a fixed focal length of 85 mm. with a light intensity of f 2. If we divide 85 by 2, we will get the physical diameter of the aperture in millimeters. In this case, the diameter of the aperture will be = 42.5 mm.

If we close the aperture to f8

then the diameter of the aperture at this value will be 10.6 mm. That is why the higher the aperture number, the smaller its what is a diaphragm physical opening.

What is aperture — we figured it out. And a little about how aperture affects depth of field. If you have just started to master the camera — then just agb directory remember! The smaller the aperture number (that is, the wider the opening) — the smaller the depth of field.