Autofocus is the last thing I am going to cover in this article. There are mainly two typed of autofocus. They work in different ways, and it is important to know about the differences when taking pictures. When it comes to digital cameras your camera normally has at least tree settings for autofocus. These are:

• AF.S (single servo AF): Focuses once and locks when shutter release button is half‑pressed. This is normally used on stationary subjects like portraits and landscapes. If you take picture of someone or something moving against you and you use AF.S the camera will focus when whatever you are taking picture of is the furthest away. It will not refocus again until you let the button go and press it again.

• AF.C (continuous servo AF): Continuously adjusts focus as it tracks the moving subject. This is typically used on moving subjects in i.e. sports and wildlife. On some cameras you can select which part of the scene it is going to track.

• AF.A (Auto AF): Different brands have different names for this, but the camera switches by itself between AF‑S and AF‑C based on subject movement.

Lesson 09: Autofocus

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