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Module 1 · Meet Your Camera
Start · Module 1
Meet Your Camera
Find every key control, understand what happens when you press the shutter, and set your camera up properly from the box. Works for any camera, including your phone.
Written by Dani Watson, founder of CapturEDU
LessonLesson 1 of 8 · 15 min · 5 reading, 10 doing
The short version
Every camera, from a phone to a pro body, does the same five things: gather light, control how much comes in, control how long it comes in for, record it, and save it.
A camera is a dark box with a hole in it. Light from the scene comes through the hole and lands on something that records it. Everything else is detail.
Follow the light from the scene to your memory card and you have the whole camera:
The five parts, in plain words
- Lens. Glass that bends light so it lands sharply on the sensor. Turning the focus ring, or letting autofocus do it, moves glass inside the lens.
- Aperture. An adjustable hole inside the lens. Wider lets in more light. Most phone lenses have a fixed aperture, so they control light in other ways; a few recent phones can change the aperture on the main camera.
- Shutter. Decides how long light reaches the sensor, from a tiny fraction of a second to many seconds. In a phone it is electronic: the sensor simply switches on and off.
- Sensor. A chip covered in millions of light-sensitive points. Each one measures how much light hit it. Bigger sensors collect more light.
- Processor and card. The camera turns those measurements into a picture file and saves it to the memory card or your phone's storage.
Why this helps you
When a photo comes out too dark, too bright or blurry, the cause is almost always one of these parts. Too dark means not enough light got through. Blurry usually means the shutter was open too long while something moved, or the lens focused in the wrong place. Knowing the path tells you where to look.
Common mistakes
- Thinking a better camera fixes blur. Blur is nearly always movement or missed focus, and every camera can suffer it.
- Touching the sensor when the lens is off. It is delicate and easy to mark.
What each part changes in your photo
Every control you'll learn in Start belongs to one of these parts. This table is the map for the whole level.
| Part | You control it with | It shows up in your photo as | Module |
|---|---|---|---|
| Lens | Zoom ring, focus ring, autofocus | How much of the scene fits; what's sharp | 11, 13 |
| Aperture | f-number (f/2.8, f/8…) | Brightness and background blur | 6 |
| Shutter | Shutter speed (1/500 s, 1 s…) | Brightness and frozen or blurred motion | 7 |
| Sensor | ISO | Brightness and grain (noise) | 8 |
| Processor | White balance, picture style, file type | Colour, contrast, editing room | 14, 17 |
Notice that three parts change brightness. That's the heart of exposure, and Module 5 shows how they work together.
The same path inside a phone
A phone has every part, just tiny. Each lens on the back is a separate camera with its own sensor. Most have a fixed aperture, so the phone usually controls brightness with shutter speed and ISO alone. To make up for the small sensor, the processor often takes several frames in a split second and blends them. That's what Night mode and HDR are doing when you hold still for a moment.
One photo, traced
You photograph a friend laughing at an outdoor café table, in the shade of an umbrella, in the afternoon.
- The lens focuses on their face, because you half-pressed with the focus point on it.
- The aperture opens wide, so the street behind is soft.
- The shutter opens for 1/500 s, fast enough to freeze the laugh.
- The sensor records the light at ISO 100, because there's plenty of it.
- The processor balances the warm afternoon colour and saves a JPEG to the card.
In Auto, the camera made every one of those choices. By the end of Start, you'll be able to make them yourself, on purpose.
Quick checkYour photo of a cyclist is blurry but the parked cars are sharp. Which part is most likely the cause?
The shutter. It stayed open long enough for the cyclist to move. The focus was fine, because the still cars are sharp.
Why some cameras feel slow
Between pressing the button and the photo being taken, three things happen: the camera focuses, measures the light, and opens the shutter. On older or cheaper cameras each step takes a moment, which is why the smile has gone by the time the photo is taken. You'll learn to remove most of that delay in Module 3 by focusing first with a half-press. For now, just know the delay is focusing and measuring, not the camera being broken.
Try it now · 10 minutes
- With the camera off, take the lens off (body facing down) or look closely at your phone's camera bump. Name every part from the diagram you can see.
- Put the lens back. Switch on, set Auto, and photograph a window from inside the room.
- Now photograph the same window from outside, or a lamp in a dim corner.
- Look at both photos. Which part of the light path decided how bright each one came out? (Answer: the camera chose a different aperture, shutter speed or ISO for each. Press INFO in playback to see them.)
- Write down the shutter speed of the darker scene. You'll compare it in Module 2.