Aut­o­fo­cus modes

There are two main au­to­matic fo­cus­ing modes to choose from: sin­gle shot or con­tin­u­ous

Digital Camera World - - CAMERA COLLEGE -

Sin­gle / One Shot

You can’t take a shot un­til the im­age is in fo­cus. Once the cam­era has ac­quired fo­cus, it stays locked at that dis­tance, and you’ll need to take your fin­ger off and back on the shut­ter re­lease to re­fo­cus.

Gen­eral pho­tog­ra­phy

For ev­ery­day sub­jects, use Sin­gle Shot AF, as this won’t let you take a pic­ture if the sub­ject is blurred.

Por­traits

Left to the cam­era, the fo­cus might be locked on the tip of the nose, so use a sin­gle AF point to fo­cus on an eye.

Scen­ics

Set an aper­ture of around f/11-16, and use Sin­gle Shot AF to lock the fo­cus about a third of the way into the scene. Con­tin­u­ous/Servo

The cam­era will con­tin­u­ously fo­cus the lens while the shut­ter re­lease is half-pressed. The fo­cus is never locked, and you can press the shut­ter to take a pic­ture even if the sub­ject isn’t in fo­cus.

Ac­tion

Con­tin­u­ous AF keeps ac­tion in fo­cus. Some cam­eras al­low you to cus­tomise the fo­cus for dif­fer­ent sub­jects.

Zoom­ing

Zoom­ing a lens can cause a sharp im­age to blur, but con­tin­u­ous AF will ad­just the fo­cus as the lens zooms.

Un­sta­ble plat­form

Shoot­ing from a rocky boat or a ve­hi­cle on the move? Use con­tin­u­ous AF to ad­just the fo­cus while you’re in mo­tion.

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