For Depth of Field Photography practice shooting with different apertures (F-stop) to learn how depth of field affects your photo. A smaller depth of field (lower F-stop number) puts the focus on your subject (like the stamen of a flower) and blurs the background. A larger depth of field (higher F-stop) will make everything in your viewfinder appear in focus, from the largest to the smallest element. Landscape photography is a prime example. Try several aperture settings until you find the perfect focus.