CS 39J > Schedule & Notes > Session 5 Detailed Notes |
Computer Science 39J
February 29, 2008
Depth of Field
-Aperture
-Focal Length – “Zoom”
-Distance from subject
-Focal Length and distance from subject correlate and cancel each other out.
-For example, you take a picture from 15 ft
away. Then, you distance yourself another 20 feet from the subject
and you want to achieve the same composition in the second photo as
you did in the first. In order to do this, you must zoom in. Therefore,
the greater the distance, the more you’ll have to zoom.
-Longer
Focal Length and subject distance tends to create better bokeh in your
photograph.
Magnification
-Circle of Confusion – the largest blur circle that will still be perceived by the human eye as a point when viewed at a certain distance.
-How
does magnifying (increasing focal length and subject distance) effect
DOF?
-DOF may help to guide the viewer to
the subject of the photo
Homework: Drawing with Light
-Use lighting for artistic value
-Take a picture where your interest is more on the light than the subject, where you use light to specifically guide the viewer to a certain subject.