Understanding Exposure Triangle- ISO,Aperture and Shutter Speed

What is Exposure Triangle? What are the components of exposure triangle?  Basically, there are three fundamental elements of exposure Triangle. Those are ISO, Aperture and Shutter Speed. Before learning taking good photos you need to know exposure triangle. Because this is the main fact of taking good photos.

What Is Exposure?

In very simple a photographer’s exposure determine how dark or light an image will appear when it has been captured by your camera.In fact, it determines what the image you capture look like.

Understanding Exposure Triangle

We already know that ISo, Aperture and Shutter Speed are the main components of the exposure triangle. If you know how to control this three components than its good. But if not then its obligatory to you to understand it.

So let’s have a look at each element closely and understand how they can help you achieve the right exposure.

Here is a visual representation of exposure triangle. As we already know exposure training have tree elements: ISO, Aperture & Shutter Speed.


Photographers need to know and understand the proper ISO settings.  Basically refers to how sensitive your camera’s sensor is to light. If you increase the value of ISO your photos will grow brighter. For this reason, ISO is a good tool to help you to capture pictures in dark environment.

Once you learn how to take advantage of the ISO, you can experiment with the images you want to capture. In general higher the below ISO (Like 100-200-400-800-1600) increase the sensitivity of the camera. In highly shutter speed, you need to increase ISO to get good photos.

Shutter Speed

Mainly shutter speed is a function of the camera. Every time photographers use the shutter button to capture the photos, So this component is very much crucial to take good photos. Basically, the shutter is compared with window.

Every time you press the shutter button, a window that opens and closes is found in front of your camera’s sensor. Shutter determine how much light enters in the sensor of your camera.

Shutter speed is measured in seconds or most case it can measure in a fraction of seconds. For example, 1/4 is a quarter of seconds, 1/2000 means one two thousands of seconds. Most modern DSLRs can handle shutter speeds of up to 1/4000th of a second, while some can handle much higher speeds of 1/8000th of a second and faster. On the other hand, the longer side of the shutter speed of most DSLR is 30 seconds.

When you are confident with shutter speed than you can play with it. slow shutter speeds allow for more motion blur when shooting action.


Aperture is a function of lenses. If the ISO is related to light sensitivity, the aperture is all about controlling the amount of light that gets to the digital sensor of your camera. The aperture refers to the size of the hole through which the light enters the camera sensor or films.

It is specified in terms of an f-stop value.Bigger the hole the more light allowed in, the small of the hole less light allowed in.

The lens aperture plays two roles, controlling both focus and exposure:

  • First, Aperture controls the amount of light entering the camera through the lens.
  • Second, it adjusts the depth of field in a scene, measured in inches, feet or meters.

Over To You

Photography is not all about knowing the basic rules it also knows about the best camera setting. One can frame a photo well but his photo may be over or underexposure than it will never be a good photo. so photography is learning the basic rules and also your camera settings.

I suggest you learn your camera before learning basic rules of photography.

Sharif Mishu

Hi, I am Sharif Mishu from Bangladesh. I am a freelance photographer. I've been in photography since 2010. I got my first DSLR in 2013. Since then I learned many things about photography from my friends, senior, and junior. But the internet was the place that taught me the basics of photography. Here at PicFact.com, I'll be sharing useful photography tips.