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Psychology 3680 Course Website http://www.psych.uleth.ca/Courses/Spring%202004/3680/3680.htm Or http://www.psych.uleth.ca And follow the links….
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Relevant URLs Byron will send relevant URLs to the course listserve following the lectures.
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Natural History of Vision
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Masks for Squinters Bartisch 1583
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Ibn Al-Haitham ca.1040.
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Leonardo daVinci ca. 1500
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Des Cartes 1664
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Peripheral Visual System Structure of the Visual System
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Parts of the eye
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Pinhole Camera
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Camera Obscura
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Diverging Reflected light goes in all directions From each point on object Only very small part passes into camera obscura At infinity rays are parallel
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Kuppers, 1972, p.25 A Small Pupil
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Kuppers, 1972, p.25 A Large Pupil
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. Functions of the Pupil Lens gathers light Lens also create problems –Spherical Aberration –Limited depth of Field Iris/Pupil is used to change the trade-off. –Bright -> smaller for better optics –Dim -> optimize for more light gathering
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. Spherical Aberration Different parts of lens converge to different focal points.
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. Spherical Aberration Reduced by small pupils: clearer vision
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Depth of Field The smaller the pupil, the larger the range of depths over which objects will be in focus.
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. Pinhole Camera Objects at different distances will be in focus. Infinite depth of field. Image plane of film is not critical for focus.
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. Large Lens Objects at different distances will be in focus at different distances behind lens Narrow depth of field.
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