You are doing nothing wrong. The problem is the camera. It is not possible to get the shallow depth of field you want because even with a wide aperture, the lens is too small in actual focal length (5.4-16.2mm). You can really only achieve those types of photos with a MILC or better yet a DSLR camera.
I have a Canon PowerShot A710 and would like to take photos with a
As per the user guide, I have turned the scene selection to Av and
chosen F1.8. Since the viewfinder showed the background in focus,
I also took a photo with a lens setting of F8.0
The photos look identical - all is in focus - no blurring of the background I was trying to achieve.
What am I doing wrong?