Basics of Exposure in Digital Photography — Exposure Triangle
What is exposure?
What affects exposure?
Why the exposure triangle is important in photography?
How does a DSLR camera work to create an exposure triangle?
- Aperture can affect the depth of field or the area of focus in an image.
- Shutter speed helps you capture action or light trails (one of the most creative aspects of exposure)
- ISO: nothing creative about it, unless you purposely want noise in your images.
How to master exposure with the exposure triangle?
- Why do you want to change the exposure settings?
- How to change the exposure settings?
- What settings should you choose in a given situation?
- Should you choose manual-mode or semi-automatic mode?
Practical Guide to Learn Exposure Triangle (Step by Step)
Here is what you need to learn exposure in photography:
- Camera with full manual controls
- Your camera’s manual if you are an utter beginner
- Tripod (optional)
- A constant light source
- A photo editor like Photoshop or Affinity Photo
- Step #1: Use a tripod and mount your camera on it. I recommend this to avoid any change in the frame as it affects your exposure and makes everything inconsistent. If you don’t have a tripod, just keep your camera on a table or something.
- Step #2: Set a focal length of your lens. Don’t change the focal length throughout this practice.
- Step #3. Focus on any object and illuminate it with a constant light source. If you use natural light, it may change and it would affect the exposure readings. Since you are learning this, I want you to use a constant light source. You don’t need to buy any external light source. Try this in indoor lighting.
- Step #4: If you are using a DSLR, switch to your LCD view. I know you are supposed to use the viewfinder, but this would help you to see the exposure change in real-time. How cool is that!
Methods of Changing Exposure
That small triangle at the +3 meter reading shows that the settings are out of the dynamic range of your camera. If it is out of the dynamic range of your camera, then you would get blown out highlights on your photographs (those blinkies on the white region in your photographs). I have skipped few stops to save some space.