4U CONTEST - UNIVERSITY
Controlling Photographic Variables
Each entry will involve either two or three photographs of the same subject showing the
effects of changing a specific photographic variable. Examples of variables are:
- polarization of light
interference and/or diffraction of light.
- vertical versus horizontal polarization of reflected light.
- polarization of scattered light.
- polarization by double refraction.
- determining stress in plastic models.
controlling depth of field.
- reflection versus transmission in thin film interference.
- using star filters.
- using diffraction gratings with different numbers of lines per centimetre.
controlling special effects.
- by changing the focal length of the lens.
- or by changing the lens aperture.
controlling film speed (ISO speed).
- using shutter speed priority to alter exposure time of a moving subject.
A title and 1.5-spaced written explanation between 150 and 250 words in length must accompany each entry. The explanation must be written by the student and demonstrate the student's understanding of the physics principles involved in the situation.
Download some examples of pictures