UNDERSTANDING APERTURE, ISO, AND SHUTTER SPEED

What Is the Exposure Triangle?

Aperture, ISO, and shutter speed make up what photographers call the "Exposure Triangle" These three settings determine how much light reaches your camera's sensor and how your final image will appear.

Think of them as three tools that work together:

• Aperture controls the amount of light entering the lens.

• Shutter speed controls how long the sensor sees that light.

• ISO controls how sensitive the sensor is to light.

When one setting changes, at least one of the others usually needs to change as well.

Aperture: Controlling Depth of Field

Aperture is the opening inside your lens that allows light to enter the camera. It is measured using f-stops such as:

• f/1.8

• f/2.8

• f/5.6

• f/8

• f/11

• f/16

Lower f-Number = Larger Opening

Examples:

• f/1.8

• f/2.8

Results:

• More light enters the camera

• Background becomes blurry

• Subjects stand out

Great for:

• Portraits

• Wildlife

• Low-light photography

Higher f-Number = Smaller Opening

Examples:

• f/8

• f/11

• f/16

Results:

• Less light enters the camera

• More of the image remains in focus

Great for:

• Landscapes

• Architecture

• Group photos

Quick Tip:

If you want a blurry background, use a lower f-number. If you want everything sharp from front to back, use a higher f-number.

Shutter Speed: Freezing or Showing Motion

Shutter speed determines how long your camera's sensor is exposed to light. It is measured in fractions of a second:

Examples:

• 1/1000

• 1/500

• 1/250

• 1/60

• 1 second

• 5 second

Fast Shutter Speeds

Examples:

• 1/500

• 1/1000

• 1/2000

Results:

• Freezes movement

• Produces sharp action shots

Great for:

• Sports

• Wildlife

• Children

• Street photography

Slow Shutter Speeds

Examples:

• 1/15

• 1 second

• 10 seconds

Results:

• Creates motion blur

• Captures light trails

• Produces silky water effects

Great for:

• Waterfalls

• Night photography

• Creative effects

Quick Tip

If your photos are blurry because of movement, increase your shutter speed.

ISO: Controlling Light Sensitivity

ISO controls how sensitive your camera's sensor is to light. Common ISO values include:

• 100

• 200

• 400

• 800

• 1600

• 3200

Low ISO

Examples:

• ISO 100

• ISO 200

Results:

• Cleaner images

• Less digital noise

• Better image quality

Best for:

• Bright daylight

• Landscapes

• Studio photography

High ISO

Examples:

• ISO 1600

• ISO 3200

• ISO 6400

Results:

• Brighter images in low light

• More digital noise

Best for:

• Indoor events

• Night photography

• Low-light situations

Quick Tip

Imagine you're photographing a historic building at sunset. You choose:

• Aperture: f/11 for maximum sharpness

• ISO: 100 for image quality

The image becomes too dark. To compensate, you might:

• Slow the shutter speed

• Increase the ISO

• Open the aperture slightly

Photography is all about balancing these three settings.