Thanks useful information: 
I used my 18-200 vr lens
first shot F3.5 18mm 1/250s ISO 200 (auto)
sec shot F22 18mm 1/8s ISO 200(auto)
The wider aperture F3.5 has a blurred background and the F22 is in focus. The shutter speed for the F22 was much slower.
When you zoom in on the wider aperture to select a part,the background is blurred and the bit you selected stands out.
Whe you zoom in with the F22 aperture the picture is still in focus with no blurring background. You can also take this picture from a lot further away right up to 200mm and still get focus with the F22 but the F3.5 only works at 18-20mm for me. Unless I am missing something. The F3.5 can be zoomed in later in the photo editing and you still get the blurred background.
I fiddle with all the modes all the time and take the same shot if I can. Probably a slow learning process!! I really appreciate this opportunity to actually have someone explain why. These were just random shots before we headed off and so were in the middle of the day.
Thanks Kathy
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