Camera Exposure Triangle (Part: Aperture). In the world of photography, you probably heard a lot about the exposure triangle. This is an analogy that explains the three main pillars or elements that give an effect on exposure. These three main pillars are interrelated and you should combine them when using them.
Based on this analogy, you can see that the combination of those three should be balanced. So that, you can get the perfect exposed photos.
Currently, the element that we will talk about is the aperture, which is one of the pillars of exposure. Especially about the definition, background, and how it works.
Definisi of Aperture
The diaphragm is a lens aperture that can be measured using the f/number value. This value indicates how much the diaphragm on the lens will open.
A large lens aperture will allow more light to enter the camera sensor. Instead, if you set a small f/number value then the lens will open and get bigger.
On the camera, you can compare the diaphragm to a pupil. It will enlarge or shrink by following the intensity of the light around it. This is the basic camera lesson that is related to the diaphragm.
From this one, you can conclude that the diaphragm is a part of the camera. This is useful to regulate the amount of light entering the camera sensor. But, how? Surely, by opening the aperture blade on the front of the camera.
Background Aperture
Using the aperture will have an effect on the background like the sharpness or blur of an image, such as:
1. Background blur
If you use a wide diaphragm e.g. f/4 or f/2.8, it will result in a narrow Depth of Field (DoF). It means that all the outside of the focus area will be blurred. Images with this diaphragm are perfect for you who like blurry backgrounds but still focus on sharp points.
2. Between blur and sharp
An aperture background of f/8 will generate between two levels of blur and sharpness. This diaphragm will separate the subject and background. Obviously, the level of background focuses is still tolerable with the limited option of ISO and shutter speed.
3. All Sharp
Then, there is a background with a very small diaphragm which is f/22. This diaphragm is ideal for you who want the whole elements in the photo to be clear and sharp. A photo like this might look great. Unfortunately, you will get a slow shutter speed. It’s even possible that you need a tripod or increase the ISO setting and it will cause a lot of grain.
How Aperture Works
As noted above, the aperture is a camera setting that can control the amount of light captured by the lens. Besides that, this element will set the background of the object as well. So, how does it works?
· Using a small f/number
When the f/number is small, then the aperture blade will be larger. The amount of light coming is also bigger. So, to take a photo with objects in a room underexposed would be better using a small f/number. Thus, DoF will be small and the image will focus only on one object with background blur.
· Using a large f/number
A large f/number will result in a smaller aperture and will make the light received also small. However, the DoF will be large so that the whole objects in a photo are in focus, including the foreground and background.
That is all the review of the camera exposure triangle. You can read about the exposure triangle related to ISO and ASA. Just a reminder, if you wish to get the best photo, keep using a combination of the three pillars of exposure. Thank you and good luck!
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