31 August 2009

Understand Digital Photography Exposure Triangle

The function of a digital camera works based on 3 basic elements. By understanding this 3 basic elements, it will help in shooting your desire photos.

The combination of this 3 elements forms a triangle known as "exposure triangle" or sometime known as digital photography exposure triangle.

The art of digital photography is mainly on playing around with this 3 elements and use it according to the photographer requirement. Therefore it is very important that this 3 elements are clearly understood.

For those who is using a Digital SLR camera, understanding of this 3 elements is very important as this will bring out the full potential of the camera and the photographer's skills.

Here are the 3 basic elements, that form a triangle known as digital photography exposure triangle
1. ISO
2. Shutter speed
3. Aperture

A brief about these 3 elements

Indicate the sensitivity of the camera towards light. The lower the ISO value, means that the sensor is less sensitive to light while the higher the ISO value, the more sensitive is the sensor to light. The down side of high ISO setting is that image produce consist of noise that degrade the quality of the image. Therefore it is prefered that most photo is taken with the lowest ISO setting, to minimize the present of noise in the picture.

Shutter Speed
How long in "time" does the sensor is exposed to light. The exposure time is control by a mechanical shutter that acts like a closed window. When light is require to enter the sensor, the shutter will open and how long it open will be determine by the period of time and hence is known as shutter speed. Therefore the shorter the time, the higher will be the shutter speed.

A camera lens works the same as a human eyes and the aperture will be the iris. The aperture is used to reduce the distance between the object and camera so that the whole object can be capture on the sensor completely. The aperture also has the function to control amount of light going into the camera by adjusting the size of the opening. Logically, the bigger the aperture size, more light will enter the camera while the smaller the aperture size, the less light will go into the camera. The size of the aperture will also have major effect on the DOF (depth of field) of the photo.

The size of the aperture is also commonly known as F stop. The smaller the number indicates the bigger the opening while the larger the number indicated the smaller the opening.

F stop will also determine the quality of a lens, this is simply because to able larger opening (Small F-stop) the more sophisticated will be the len's design, hence more expensive it will be.

Above is just a brief about digital photography triangle. Indepth understanding of each element will be discuss later for better understanding.

Basic rule of thumb,
Fix the ISO, Adjust the aperture for the types of photo you want and adjust shutter speed to get the correct exposure.

4 Snaps:


The photography workshops are very general, will focus on the people who attend, get as detailed as they lead it, and go pretty much into any topic, area, they feel they need. They will explore things like definition of terms, focus, depth of field, composition, etc., but the emphasis will be that once you know the rules, feel free to break them, as that’s what creative photography is all about.

Dear Bennett, thanks for visiting. are you commenting on my post of just a gesture of saying Hi


I read your post on Digital Photography and the tips you have provided on digital SLR camera is awesome. Thanks for sharing this useful information and look forward to see more from you.


Thanks for the compliment. Will work harder to get more information in here.

Post a Comment

Twitter Delicious Facebook Digg Stumbleupon Favorites More