Mary J.(a really good research...) (sera)

click on the image to see the enlargment
Depth of Field: Is the range or distance within ones subject that is still fairly sharp. The depth of field varies depending on the type of camera, the focus distance, and aperture. Also, the size of the print and the distance at which it is viewed can effect ones perception of it.
A way to calculate depth of field is through this web site
http://www.dofmaster.com/dofjs.html