The Basics of Photography

Part 1: The Basics

The Exposure Triangle

Photography, at its core, is simply the art of capturing light. The word "photography" actually comes from Greek words meaning "drawing with light." To draw a beautiful picture, you need complete control over how much light enters your camera.

To control this light, you have three incredibly powerful tools at your disposal. Together, they are called the Exposure Triangle. If you master these three tools, you will never need to shoot on "Auto Mode" ever again. Let's start with the first and most creative tool: Aperture.

1. Aperture (The Pupil)

Imagine your camera lens is like a human eye. When you walk into a very dark room, your pupil opens up very wide to let in as much light as possible so you can see. When you step outside into the bright, blazing sun, your pupil squeezes down into a tiny dot so you don't go blind.

Inside your camera lens is a mechanical pupil made of metal blades. This is called the Aperture. You can control exactly how wide or how narrow this pupil opens. The size of the pupil is measured in confusing numbers called "f-stops" (like f/1.8 or f/16).

The golden rule that confuses every beginner is this: A smaller number means a bigger hole.

• f/1.4 or f/1.8 (Wide Open): The pupil is massive. It lets in a huge amount of light. This is perfect for taking pictures in dark rooms or at night. More importantly, a massive pupil causes the background of your photo to become incredibly blurry, which makes your subject pop out! This blur is called Bokeh.
• f/8 or f/11 (Medium Hole): The pupil is half closed. It lets in a normal amount of light, perfect for a cloudy day.
• f/16 or f/22 (Narrow/Closed): The pupil is a tiny pinhole. It lets in very little light, making it perfect for the bright noon sun. Because the hole is so tiny, everything in the picture from the grass at your feet to the mountains miles away will be perfectly sharp and in focus.

By simply changing the size of the pupil, you have completely changed how your photograph looks and feels.

Part 2: Advanced Techniques

Controlling Time

The second tool in the Exposure Triangle doesn't control the size of the light; it controls the time the light is allowed to hit the camera sensor. This tool is the Shutter Speed.

2. Shutter Speed (The Eyelid)

Behind the lens, right in front of the digital sensor, your camera has a mechanical eyelid called the Shutter. When you press the button to take a picture, this eyelid blinks to let the light hit the sensor. You control exactly how fast that eyelid blinks.

The shutter speed is measured in fractions of a second, and it is your primary tool for controlling motion in a photograph.

• Fast Shutter (1/1000s, 1/2000s): The eyelid opens and closes in one one-thousandth of a second! This is lightning fast. It completely freezes anything that is moving quickly. If you want to photograph a cheetah running, a basketball player dunking, or water splashing from a fountain perfectly frozen in mid-air, you must use a fast shutter speed. The trade-off? Because it blinks so fast, very little light gets in, making the picture darker.
• Medium Shutter (1/60s, 1/125s): The eyelid blinks at a normal speed. This is fast enough to take a picture of a person sitting still without your own hands shaking and making the picture blurry. This is where you will shoot most normal portraits.
• Slow Shutter (1/10s, 1s, 10s): The eyelid stays open for a very long time. Because it is open for seconds at a time, it lets in massive amounts of light, making it perfect for taking pictures of the stars at midnight. However, if anything moves while the eyelid is open, it will record as a blurry, smeared streak. You absolutely must put your camera on a heavy metal tripod when using a slow shutter, or your own breathing will ruin the photo!

Understanding shutter speed allows you to decide if you want to freeze time permanently, or stretch time out to show beautiful, flowing motion.

Part 3: Professional Mastery

The Digital Amplifier

You now know how to control the size of the light (Aperture) and the time of the light (Shutter Speed). But what happens if you are in a pitch-black room, your Aperture is as wide as it goes, and your Shutter Speed is as slow as you can hold it, and the picture is still too dark? This is where you use the final tool: ISO.

3. ISO (The Volume Knob)

Unlike Aperture and Shutter Speed, ISO is not a physical, mechanical part of the camera. It is a digital setting. Think of ISO exactly like the volume knob on a car radio.

If you are listening to a very quiet radio station (a very dark scene), you can reach over and turn the volume knob (the ISO) all the way up to 10 so you can hear the music (brighten the picture). However, when you turn a radio up to maximum volume, you don't just hear the music louder—you also hear the ugly, fuzzy static in the background.

• Base ISO (Often 100, sometimes 64 or 50) (Low Volume): This is the base level of the camera. The picture is perfectly clean, smooth, and beautiful. There is zero static. However, it requires a lot of real light (from the sun or a flash) to expose the picture properly.
• ISO 800 - 1600 (Medium Volume): The picture is artificially brightened by the camera's computer. It is very useful for shooting indoors or in the shade. You might see a tiny bit of static if you zoom in very closely, but it looks great on a phone or printed small.
• ISO 12800 (Maximum Volume): If it's pitch black outside and you are trying to photograph a moving animal, you can crank the ISO up to maximum to artificially brighten the picture! But because the volume is so high, the picture will be covered in ugly, colorful digital "noise" (grain). The static is overwhelming.

The Master's Rule of ISO: A master photographer always tries to keep their ISO as low as absolutely possible (their camera's Base ISO). They will always try to add more light by using a wider aperture, a slower shutter speed, or an external flash *before* they touch the ISO knob. ISO is your last resort to save a dark photo.