Autumn tree: I like the angle of this shot because it enhances the trees large size. Additionally I like the shallow depth of field, focussing the lower leaf yet enhancing its colour with the out of focus background.
Depth of Field Photos, emering and coming out of...
Aperture Vs. Depth of Field Visual Guide » Expert Photography
How to use aperture to get a nice blur effect. The depth of field can make a picture go from normal to amazing. Try using this to better your photos, this website has a lot more helpful information. -JPH
depth of field chart - photography This makes it a lot easier to remember the way the f stops work
Download your free cheat sheet to help you get off AUTO and start getting more creative photos with your Digital Camera. IT shows you how you can control Depth of Field. It shows the best Aperture for Portraits and the best Aperture for Landscape photos. It also looks at another key factor in controlling Depth of Field: Focusing Distance.