Lesson 2/Learning Event 4
Learning Event 4:
STATE THE EFFECT ON PERSPECTIVE FOR A GIVEN FOCAL LENGTH LENS
1. The human eye sees objects in three dimensions: height, width and depth.
A photographic lens reproduces objects onto the focal plane in only two
dimensions: height and width. The missing dimension, depth, is suggested by
the relative size and position of the various objects in a picture. Note in
figure 2-10 that you are looking down a road with evenly spaced trees on
both sides.
Notice how the road decreases in width and the trees appear
closer to each other as the depth increases.
Figure 2-10.
Depth as viewed by the eye or normal lens
2. Changing the focal length of a lens DOES NOT change the actual depth
perspective.
Depth perspective is dependent on lens-to-subject distance.
Focal length, however, changes the apparent perspective because the camera
does not record as much of a scene with a telephoto lens as it does with a
normal lens (fig 2-11).
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