The short answer: a few settings do most of the work
Camera menus can list dozens of options, but a small group controls most of what you see in the final image. For most beginners those are aperture, shutter speed, ISO, white balance, and focus mode. Everything else can usually wait until those feel familiar.
The first three settings together control exposure, which is how bright or dark a photo turns out. The other two affect colour and where sharpness lands. This guide walks through each one and then shows how to choose them in a real situation.
Exposure: the idea behind every setting
Exposure is the amount of light that reaches the sensor (or film) when you take a picture. Too little light and the image looks dark with weak shadow detail. Too much and bright areas lose detail. Our article on what exposure means and how to get it right covers this in more depth.
Aperture, shutter speed and ISO are the three controls. Each one changes brightness, and each also has a side effect on the look of the picture. That is why photographers talk about a “triangle”: change one corner and you usually need to adjust another to keep the same brightness.
Aperture: how wide the lens opens
Aperture is the adjustable opening inside the lens. It is written as an f-number such as f/1.8, f/4 or f/11.
- A small f-number means a wide opening. More light gets in, and the background tends to look softer (shallower depth of field).
- A large f-number means a narrow opening. Less light gets in, and more of the scene tends to look sharp.
Typical choices are wide apertures for portraits, where you want the subject to stand out from the background, and narrower apertures for landscapes, where you want more of the scene in focus. Actual depth of field also depends on focal length and distance to the subject, so treat these as starting points, not rules.
Shutter speed: how long the sensor is exposed
Shutter speed is the length of time the shutter stays open. It is shown as seconds or fractions of a second, such as 1/500 or 1/30.
- Fast speeds (for example 1/500 and faster) tend to freeze movement.
- Slow speeds (for example 1/30 and slower) let in more light and show motion as blur, and they make camera shake more likely when handholding.
If you are unsure how to read those fractions, see the shutter speed chart, which explains values like 1/15 and 1/60.
ISO: how much the signal is amplified
ISO sets the sensitivity of the camera’s output to light. A low value such as ISO 100 usually gives the cleanest image. Raising ISO makes the picture brighter for a given amount of light, but it generally increases visible noise. Many photographers keep ISO as low as the situation allows and raise it when the other two settings cannot give a bright enough, sharp enough picture.
Video cameras often call a similar control gain. The relationship is covered in ISO vs gain.
How the three trade off
Each step of change is called a stop, and one stop doubles or halves the light. Suppose a scene is correctly exposed at f/4, 1/125, ISO 400. If you want a narrower aperture of f/8 for more depth of field, that is two stops less light. You could compensate by slowing the shutter to 1/30 (two stops more light), or by raising ISO to 1600, or by splitting the change between them.
The right choice depends on your priority:
| Priority | Setting to protect | What you give up |
|---|---|---|
| Blurred background | Wide aperture | Less depth of field margin for focus errors |
| Frozen action | Fast shutter speed | May need higher ISO or wider aperture |
| Cleanest image | Low ISO | May need a slower shutter or wider aperture |
White balance, focus mode and file format
White balance tells the camera what colour light the scene has, so whites look neutral. Auto white balance works well in many cases. If photos look too orange or too blue, try a preset such as daylight or tungsten, or set it later when editing, which is easier if you shoot RAW.
Focus mode decides how the camera focuses. A single-shot mode (often called One Shot or AF-S) suits still subjects. A continuous mode (AI Servo or AF-C) tracks moving subjects. Choosing the focus point, or letting the camera choose, determines where sharpness lands. The autofocus modes guide explains the options.
File format: RAW files keep more information for editing than JPEG, at the cost of larger files.
Choosing a shooting mode
Most cameras have a mode dial or menu that decides which settings you control:
- Auto sets nearly everything.
- Aperture priority lets you pick the aperture while the camera chooses shutter speed.
- Shutter priority lets you pick shutter speed while the camera chooses aperture.
- Manual gives you all three.
Many people find aperture priority a comfortable place to learn. When you want full control, our manual mode guide explains the process step by step, and the Canon mode dial article explains the labels on a Canon dial.
A simple starting workflow
- Set the file format and check white balance.
- Pick a mode, for example aperture priority.
- Choose the aperture for the look you want.
- Set ISO low, or use auto ISO with a sensible upper limit.
- Check the shutter speed the camera picks. If it is too slow for handheld sharpness or for your moving subject, widen the aperture or raise ISO.
- Take a test shot and review it, including the histogram if your camera offers one.
- Adjust with exposure compensation and repeat.
Common beginner questions
What are some basic tips for good photographs? Hold the camera steadily, pay attention to light, choose the focus point deliberately, keep ISO low when you can, check results after a few shots, and compose with the edges of the frame in mind.
What is the 60/30/10 rule? It is usually described as a design guideline for balancing three colours in a scene (roughly 60 percent, 30 percent and 10 percent of the frame). It is a composition idea, not a camera setting, and you do not need to follow it.
Where to go next
Learn exposure thoroughly first, then practise reading shutter speeds, and then try manual mode when you are comfortable. Settings become far less intimidating once you know what each one trades away.