ctLow's Photography Basics
-on this page:
- Changing perspective
- Four Tripod Positions
- Depth of Field
- Maintaining perspective
Focal Length and Depth of Field Demonstrations
Two models in the same spots in all photos, from four different tripod positions
(overpaid self-indulgent dilettanti, actually!)
This page illustrates principles discussed in Photography Basics.
Change in Perspective
Four focal lengths from four positions (medium aperture)
(and the subjects did not move!)
Position 1 - 4x-mag lens |
Position 2 - ~2x-mag lens |
Position 3 - 1x-mag lens |
Position 4 - ~0.5x-mag lens |
ctLow's Photography Basics Demonstration Page
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Vantages - Four Tripod Positions
-photographer at right arrow, two subjects at other two arrows
(for comparison with the examples presented on this page)
Position 1 |
Position 2 |
Position 3 |
Position 4 |
ctLow's Photography Basics Demonstration Page
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Depth of Field and Aperture
-illustrates greater depth of field with smaller apertures, more noticeable with longer lenses
(focus always on near subject)
Position 1 - 4x-mag lens small aperture |
Position 1 - 4x-mag lens large aperture |
Position 2 - ~2x-mag lens small aperture |
Position 2 - ~2x-mag lens large aperture |
|
Position 3 - 1x-mag lens small aperture |
Position 3 - 1x-mag lens large aperture |
Position 4 - ~0.5x-mag lens small aperture |
Position 4 - ~0.5x-mag lens large aperture |
ctLow's Photography Basics Demonstration Page
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Maintenance of Perspective
-cropped centres of wider angles equals perspective of telephoto
|
Position 1 - 4x-mag lens (except tripod inadvertently moved before following photos - darn!) | |
Position 1 - ~2x-mag lens |
Position 1 - ~2x-mag lens (cropped, enlarged) |
Position 1 - 1x-mag lens |
Position 1 - 1x-mag lens cropped, enlarged |
Position 1 - ~0.5x-mag lens |
Position 1 - ~0.5x-mag lens cropped, enlarged |
Note: in deference to the advent of digital cameras since this page was first posted, and the varying size of image sensors from one camera to another, I have changed all of the lens focal lengths to magnification ratios, e.g. for a 35mm camera, as used for these demonstration photos, "50mm" becomes "1x-mag", "24mm" becomes "~0.5x-mag", etc. I hope that reduces confusion (and that the concept catches on!).
ctLow's Photography Basics Demonstration Page
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Photography Basics and all images are Copyright © 2001-2004 ctLow
-first posted: 2002-01-12
-updated: 2015-12-26