Understanding Settings
After you take the suggested first test shot, review the image and the histogram, then decide what to change. Here is a quick guide to the key controls.
Histogram
A graph that shows the brightness of your image.
- Left side = shadows / dark areas
- Right side = highlights / bright areas
A good starting exposure usually keeps the graph away from both extreme edges.
- If the graph is piled up on the left → the image is too dark → increase exposure
- If the graph is piled up on the right → the image is too bright → decrease exposure
Aperture (f-number)
Controls how much light enters and how much of the scene is sharp.
- Lower number (f/2.8) = more light + more background blur
- Higher number (f/11) = less light + more of the scene in focus
After the first shot: open up (lower f-number) for more blur or light; close down (higher f-number) for more sharpness throughout the scene.
Shutter Speed
Controls how long the sensor is exposed to light and whether motion is frozen or blurred.
- Faster (1/1000 s) = freezes action
- Slower (1/30 s or longer) = shows motion or lets in more light
After the first shot: increase speed to stop blur; decrease speed to add motion or gather more light (use a tripod for slow speeds).
ISO
Controls the sensor’s sensitivity to light.
- Lower ISO (100) = cleanest image
- Higher ISO (1600+) = brighter image but more noise/grain
Raise ISO only when you need a faster shutter or smaller aperture and cannot get enough light otherwise.
Camera Modes
- Manual — You set aperture, shutter, and ISO. Full control. Best for consistent light or long exposures.
- Aperture Priority (A/Av) — You set aperture; camera sets shutter. Best when background blur or depth of field is the priority.
- Shutter Priority (S/Tv) — You set shutter; camera sets aperture. Best when freezing or showing motion is the priority.
Focus Modes
- Single-point / One-shot — Focuses once when you press the shutter. Best for still subjects.
- Continuous (AF-C / AI Servo) — Keeps focusing while you hold the shutter. Best for moving subjects.
- Manual focus — You control focus yourself. Best for landscapes, macro, night, or when autofocus struggles.
How They Work Together
Aperture, shutter speed, and ISO all control exposure. They are linked by “stops.”
One stop means doubling or halving the amount of light.
- Changing shutter speed from 1/60 s to 1/120 s is one stop less light.
- Opening the aperture from f/5.6 to f/4 is one stop more light.
- Raising ISO from 100 to 200 is one stop more sensitivity.
To keep the same overall exposure when you change one setting by one stop, you must compensate by changing another setting by one stop in the opposite direction.
Example
You take the first test shot at 1/60 s and f/5.6.
You decide you want a faster shutter speed to freeze motion, so you change to 1/120 s (one stop less light).
To keep the same brightness, you open the aperture one stop to f/4 (one stop more light). The exposure stays the same, but the image now has less motion blur and more background blur.