A Beginer's Guide to Photography

How's The camera Work..

Aperture, shutter speed, ISO are the elements that combine to create an exposure.

Aperture
Exposure happens in three steps, starting with the aperture. This is the hole inside the lens, through which the light passes. It’s similar to the pupil of your eye: the wider the aperture, the more light is allowed in and vice versa.
As the aperture widens, the f/number gets lower and more light is allowed into the camera. This is great for low light but be aware that it’s going to make the depth of field very shallow – not ideal when taking landscapes.
Exposure will be much easier if you can memorise the f/stop scale.
The scale is as follows: f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22.

Shutter Speed

Once the light has passed through the aperture of the lens, it reaches the shutter Now you need to decide how much of that light you’re going to allow into the camera.
Ordinarily, you only want a very small fraction of a second (for example 1/250) to prevent motion blur. However, different shutter speeds complement different situations: anything from really fast (1/4000) for sports photography to really slow (30 seconds) for night photography.
It all depends on what you’re shooting and how much light you have available to you.

ISO

Once the light has passed through the aperture and been filtered by the shutter speed, it reaches the sensor, where we decide upon the ISO.
As you turn the ISO number up, you increase the exposure but, at the same time, the image quality decreases; there will be more digital noise or “grain”.
So you have to decide upon your priorities in terms of exposure vs grain.

This is the example of chart to understand how that APENTURE,SHUTTER SPEED, AND ISO affects each other