Introducing

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Introducing

• The OAPT Photo Contest for World Year of Physics
• created by Alan J. Hirsch

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OAPT Physics Photo Contest

• For Grade 12 Ontario Physics Students
• 2 Categories (12C and 12U)
• Created and sponsored by Alan Hirsch

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For 12Cs - Physics in Action

• Theme changes each year
• 2005 Motion/Forces and/or Machines
• Submit Photo(s) plus explanation

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Motion time-exposure photo with an exposure
time of 1/10th of a second and an aperture value
of 32. The result shows that the cars in the
express lanes are travelling faster than the cars
in the service lanes, as seen by comparing the
two cars in the foreground.
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For 12Us - Controlling Photographing Variables

• Submit series of 2 or 3 photos plus explanation

• Polarization
• Interference
• Depth of Field
• Shutter Speed
• Film speed

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Polarization Maximum reflected light absorbed
when polarizing crystals aligned vertically
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The photo with the shallow depth of field was
taken at a wide open aperture of f 4.5 at
1/500th of a second. The depth of field ranges
from about 0.6 m to 1.2 m. Much of the image is
blurred because the aberration caused by using
the outer circumference of the lens.
The photo with the larger depth of field was
taken with a smaller aperture of f 11 at 1/100th
of a second. The depth of field ranges from about
0.4 m to 4 m. The image is much less blurry
because there is less aberration when only the
centre portion of the lens is used.
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Coordination of Contest

• Diana Hall will coordinate
• Photos will be sent to Bell H.S.

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Judging

• Preliminary selection will be done by committee.
  Top 40 selected.
• Final judging will be done at OAPT annual meeting
  (Format TBA)
• Prizes awarded before end of school year
• Final decisions made by Alan Hirsch

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Prizes for Winners

• 1st Place in Each Category - 200
• 2nd Place in Each Category - 100
• 3rd Place in Each Category - 50
• Plus Honourable Mention
• Certificates for all winners and HM
• Prizes provided by Alan Hirsch

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Information coming soon to...

• On OAPT website (http//www.physics.uoguelph.ca/OA
  PT/)
• OAPT Newsletter

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