Solution
2. Press the <

> button, choose [AF Frame] on the [Shooting] [

] tab, and then choose [Tracking AF].
3. Aim the camera so that [

] is on the desired subject.
Press the shutter button halfway. [

] changes to a blue [

], which follows the subject as the camera continues to adjust the focus and exposure (Servo AF).
- If no subject is detected, (

) is displayed.
4. Press the shutter button all the way down to shoot.
Tracking AF is possible in the following shooting modes.

... Tracking AF can be set
Model | Shooting mode |
, , , , , , , , , * |
PowerShot ELPH 150 IS / IXUS 155 PowerShot ELPH 140 IS / IXUS 150 PowerShot ELPH 135 / IXUS 145 |  |
*Not available on PowerShot ELPH 150 IS / IXUS 155, or PowerShot ELPH 140 IS / IXUS 150