dslr lenses- get to know all about telephoto, prime lenses, wide angle and kit lenses! Which to use for faces, which to use for places, and everything in between. (great info for beginner photographers)
The Essential Guide to Filters for Digital Cameras :: i have used filters on some jobs that i've done. before, i didn't think it made that much of a difference, but in the end, it does. on my SLR negative film camera, i keep a filter on it to protect my lens from scratching, dust, all that stuff!
Depth of Field: The pictures above change the aperture setting of the camera lenses, creating a sense of depth in their images. The larger the apertures (smaller F-stop number) and closer the focusing distances, the shallower depth of field is. Other example of Shallow Depth of Field: http://digital-photography-school.com/17-beautiful-images-with-shallow-depth-of-field