Hi Katiesmom,
The first shot, I would have preferred a smaller aperture (f16-f22), but I needed to capture the gentleman with his dog, the light was low, so I upped the ISO to 400 and managed 1/10 sec @ f8, still, if you look closely the dog is slightly blurred.
So, it was a compromise between DOF and sharp subject.
Generallly I use small aperure (generally f22) to make sure everythinng is in focus. and as most of my shots are with a tripod, shutter speed is generally not an issue.
The shot with the web, I tried to keep the subject in focus, and leave the BG blurred, hence the aperture selected.
Hope this helps ?
Canon 1DS MKIII,7D, 85 1.2L, 24 F1.4L, 135 F2L, 200mm F2.8L,50mm F1.4, 120-300 F2.8, 12-24mm f 4.5
http://www.lesmclean.co.uk/
Concentrate on equipment and you'll take technically good photographs. Concentrate on seeing the light's magic colours and your images will stir the soul. - Jack Dykinga