So What Is Aperture?

What is aperture? In some of the reviews you may of seen a mention of this, so if you are wondering what it is then this article is here to help define aperture for you.

An aperture is a hole or an opening through which light travels. It is one of the three pillars of photography where the other two are ISO and shutter speed. Aperture adds a dimension to a photograph by blurring the background or bringing everything in focus.

what is aperture?



In optics, iris of the lens that controls the size of the aperture is called “diaphragm” in optics. Diaphragm’s sole purpose is to block all the light with the exception of the light that goes through the aperture. In photography, the aperture is expressed in f-numbers such as f/1.4. These f-numbers that are known as “f-stops” are a way of describing the size of the aperture, or how open or closed the aperture is. A smaller f-stop such as f/2.8 means a larger aperture, which isolates the foreground from the background by making the foreground objects sharp and the background blurry. A larger f-stop such as f/32 means a smaller aperture which brings all foreground and background objects in focus.

For classic portraiture we separate our subject from the surroundings by using “selective focus.” Choosing a large aperture or lower f/stop, like f/2.8, creates very shallow depth of field with only the subject, or just a portion of the subject in focus. In a landscape or scenic photograph, we usually want to see as much detail as possible from foreground to background. This can be achieved by choosing a small aperture or higher f/stop, like f/8 or f/11.

The f/stop also affects shutter speed. Using a low f/stop means more light is entering the lens and therefore the shutter doesn’t need to stay open as long to make a correct exposure which translates into a faster shutter speed. The reverse is also true, that is using a high f/stop results in less light entering the lens and therefore the shutter will need to stay open a little longer which translates into a slower shutter speed.

Hopefully this article has made made you understand the definition of aperture a little better, if it hasn’t, it doesn’t matter as there are many more important features to look out for while purchasing a dash cam.