Manual mode means you choose aperture, shutter speed and ISO yourself, instead of letting the camera choose. The simplest route is to set the setting that matters most for your picture first, then balance the other two until the exposure meter reads near zero.
The Three Settings
| Setting | What it controls | Typical effect |
|---|---|---|
| Aperture | Size of the lens opening | Depth of field and light |
| Shutter speed | How long the sensor is exposed | Motion blur or frozen action |
| ISO | Sensor sensitivity | Brightness, with more noise at high values |
Think of them as three controls on one tap: change one and you must adjust another to keep the light balanced.
A Simple Routine
- Turn the mode dial to M. Set the camera to shoot RAW if possible.
- Set ISO first. Use 100 to 200 outdoors in daylight, and raise it indoors or at dusk, perhaps to 800 or higher.
- Choose aperture for the look you want. A small number such as f/2.8 blurs the background, and a larger number such as f/8 keeps more of the scene sharp.
- Set shutter speed for motion. As a guide, 1/125 or faster suits people standing still, and 1/500 or faster freezes most movement.
- Look at the exposure meter in the viewfinder. Move the shutter speed until the marker sits near the center.
- Take a photo and check the screen image and histogram. If the picture is too dark, slow the shutter, open the aperture or raise ISO. If it is too bright, do the opposite.
- Repeat as the light changes.
These are baseline figures, so adjust as you learn.
Common Beginner Problems
- Blurry pictures: usually a shutter speed too slow for handheld shooting. A useful rule is to use at least 1 divided by the focal length, so 1/50 for a 50mm lens.
- Grainy pictures: ISO is too high. Add light or open the aperture first.
- Soft focus: the aperture may be so wide that the depth of field is very thin.
Practice Ideas
Spend a session changing only one setting at a time and look at the results. Shoot the same scene at three apertures, then at three shutter speeds. This builds an instinct faster than reading about it.
Keep each practice session short and note which settings you used for each frame. Reading your own results is the quickest way to learn.
FAQ
Should I always use manual?
No. Aperture priority is great for fast work. Manual is best when you want consistent exposure across many shots.
What is the exposure triangle?
It is the relationship between aperture, shutter speed and ISO. Change one and the others must adjust.
The Short Version
Set ISO for the light, aperture for the look, shutter speed for the motion, and use the meter to balance them. Check the histogram, adjust, and practice one setting at a time.
