Tony de Jesus

Thanks for the great reply - you answered all my questions.

Just wondering, when calculating depth of field, do you factor in the camera's crop factor? I'm using a 7D right now, and when compared to a 35mm frame of film, it has a crop factor of 1.6. If I'm using a 50mm prime at f2.8, should I calculate the depth of field using a focal length of 80 (50mm x 1.6) or just use 50mm? Thanks