Lesson 3: Shooting Modes

Auto hands everything to the camera — fine when you need a fast shot with zero creative decisions, but it can't know you want a blurred background or frozen splash.

Aperture Priority is what most photographers use most often: you set aperture (your strongest creative opinion, usually), the camera handles shutter speed. Shutter Priority flips that — useful when freezing or blurring motion is the priority.

Manual gives you full control of all three settings. It sounds harder than it is — once you understand the exposure triangle, Manual is really just Aperture and Shutter Priority combined, with nothing left for the camera to guess. It becomes essential in inconsistent lighting (stages, backlit subjects) where automatic metering keeps getting fooled.

The rest of the dial

Program (P) also chooses aperture and shutter speed for you, but unlike Auto it leaves everything else to you: ISO, white balance, exposure compensation, focus mode, flash. On most cameras, turning the main dial in P (program shift) swaps between equivalent combinations — from f/8 at 1/125 to f/4 at 1/500, for example. Both let in the same amount of light; one gives more depth of field, the other freezes more motion.

Dial labels vary by brand. Aperture Priority is usually marked A, or Av on Canon and Pentax; Shutter Priority is S, or Tv on the same two brands. Some cameras have no mode dial at all and use an A position on the aperture ring and shutter speed dial instead — the logic is the same.

Auto ISO works alongside these modes, including Manual on most current cameras: you fix aperture and shutter speed, and the camera adjusts ISO to keep the exposure right. Most cameras let you cap the maximum ISO and set a minimum shutter speed for Auto ISO, which stops it choosing settings you'd reject.

In P, A and S, the camera's meter decides the overall brightness. When a scene fools it — snow, a dark stage, a person against a bright window — exposure compensation (the +/− control, set in stops) tells it to go brighter or darker without leaving the mode. In Manual with a fixed ISO it usually does nothing, because you are setting the exposure yourself.

Choosing a mode, step by step

1. Ask what matters most in this shot: depth of field (controlled by aperture), motion (controlled by shutter speed), or neither.
2. If it's depth of field — portraits, landscapes, products — use Aperture Priority and choose the f-number.
3. If it's motion — sport, pets, moving water, a panning shot — use Shutter Priority and choose the shutter speed.
4. If the light is steady but the scene keeps fooling the meter, or you need identical exposures across a series (a panorama, product shots on one background), use Manual.
5. Set ISO to Auto with a maximum you're happy with, or fix it yourself, then take a test frame and check the histogram before carrying on.
6. If nothing about the shot needs a creative decision and speed matters more, Program or Auto is a perfectly good answer.

A worked example

At a children's football match on an overcast afternoon, you want players sharp mid-stride. You switch to Shutter Priority and set 1/1000 s; the camera sets the aperture and, with Auto ISO capped at 6400, raises ISO as the light fades. When a player stops to take a corner kick and you want a softer background behind them, you switch to Aperture Priority at the lens's widest setting, say f/4, and let the camera pick the shutter speed — still fast enough, because the player is standing still. Later, under the floodlights, the meter keeps brightening the frame to compensate for the dark sky behind the players, and faces come out too bright. That's the moment for Manual: 1/500 s, f/4 and an ISO that renders skin correctly, checked once against the histogram. Now the exposure stays the same however much dark sky is in the frame. To see how other combinations would give the same exposure, try the Exposure Calculator.

Common mistakes

• Treating Manual as a badge. A blurred action shot in Manual is still blurred; the mode that gets the shot is the right one.
• Forgetting what Auto ISO is doing. In dim light it can climb high enough to add visible noise — set a maximum.
• Using Aperture Priority on moving subjects without watching the shutter speed. As light fades the camera slows the shutter to hold exposure, and motion blur creeps in. Keep an eye on it, or set a minimum shutter speed for Auto ISO.
• Leaving exposure compensation dialled in. A +1 set for a snow scene overexposes the next scene too; reset it to zero when the scene changes.
• Expecting the mode dial to handle focus. It controls exposure only — moving subjects still need continuous autofocus and, often, burst mode.

A natural progression: Auto → Aperture Priority for a few weeks → Manual once adjustments feel intuitive rather than mysterious. Plenty of photographers stay in Aperture Priority permanently and get excellent results — there's no required finish line.