Exposure,Shutter speed,Aperture and ISO.

In this article I will tell you about what your exposure depends on? You will learn about what Aperture is? What is the Depth of Field? What is shutter speed and what is ISO?

So, Exposure depends on three things;

-Aperture

-Sutter Speed

-ISO

Let us start from the top. What is Aperture? Well, the aperture refers to the opening of the lens or it is size of opening of lens and it depends on its value. If you look at your lens you will see the blades. The bigger your aperture size is the morelight comes in and the smaller your aperture size is the less light will cross. The aperture value is determined by its F-stop value for example, if you set a value of F1.8 then the opening size of your lens is bigger and the more lights will come in which will give your more bright picture. The size of the opening of your lens depends on your F-stop value and that size decrease with the increase of F-stop value. We can say that F-stop value is inversely proportional to the size of the opening of your lens.

Now, the second thing that depends on your aperture which is the Depth of Field. Well, to give you more understanding about what depth of field is, I will discuss it in detail. 

When you look at the picture we often talk about the subject (which is the main part of the picture), background (which is everything behind the subject) and foreground (which is everything in front of the subject). Here is the first point, if you want your subject, background and the foreground to be in focus you required a large depth of field. Secondly, if you want your subject to be in focus and have the background and foreground to be out of focus you require a small or shallow depth of field. So, how much area you want to be in or out of the focus is determined by Aperture. If you want to take a picture with small or shallow depth of field you have to take a picture with small f-stop like f1.8 which means the size of the lens opening should be larger. Similarly, f8 will give medium depth of field means the area which is out of focus will be smaller as compared to f1.8 while f22 will give you large depth of field which means that your subject, foreground and the background will be in focus.

Now, the second thing that affects your exposure is shutter speed. Well, the shutter speed refers to how fast your shutter opens or closes means for how much time your lens remains open to capture your exposure .So, the fast your shutter speeds the less is the light passes through for your exposure and the slower your shutter speed is that means more light passes through for your exposure.
Note: If you are taking a picture with small shutter speed for example f/13 you will get a shaky exposure to avoid this always you tri-pod to take a long exposure shot.

Now, the third thing effects your exposure is ISO. Well, the ISO refers to how much light-sensitive your lens is. The lower the ISO the lens sensitive is your lens to light and the higher the ISO the more sensitive your lens is to light.
Note: The higher you raise your ISO the more grain or the more dots you will see in your image

So, it is not difficult to understand about IS0, aperture, and shutter speed. All you need to do is to learn how to balance it out.

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