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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is considered the "eye of the camera system"?
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the lens
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What are the four main functions controlled by the lens?
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1. (image) focus
2. quantity of light 3. image area 4. depth of field |
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How does the lens work? (brief)
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Gathers light rays,
focuses converging rays on point behind lens (the focal plane) |
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How does the lens work in relation to the film camera? the video camera?
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FC - the film rests on the focal plane
VC - the light sensitive computer chip rests on the focal plane |
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How does focus work in a picture?
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it conveys importance!
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How is the quantity of light related to f-stop?
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the fstop numbers like 1.4, 2, etc let in much more light than the bigger numbers like 16, 22.
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What is the super duper f-stop formula?
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f-number = focal length
------------ lens diameter |
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What is a fast lens?
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A fast lense is one that has very low max f-stops like f1.4, f2 etc! (b/c fast is better i like more fstops at the bottom:) )
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What is image area controlled by?!
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focal length :(
(D* hand coming out of the lens barrel, tweaks the image area) |
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What do you call a lens with a fixed focal length?
What's a lens with a variable focal length? |
a prime lense.
a zoom lense! |
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What is the defining property of a zoom lens?!
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A variable focal length.
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What kind of angle of view will a short lens have?
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a wide angle of view
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What is another name for a short lens?
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A wide angle lens!
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What is the relation between the focal length of the lens and the image area?
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The longer the focal length, the smaller angle of view (smaller image area)
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What is depth of field?
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the zone of the picture that is reasonably sharp
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What 3 factors control depth of field?
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1. lens opening (aperture)
2. focus distance (camera to subject distance) 3. focal length |
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What length of lens creates the unwanted effect of distortion?
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short
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distortion = bad
short = bad |
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What happens to depth of field with larger apertures?
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Smaller depth of field
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The larger the aperture, the _ depth of field
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smaller!
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the farther the distance from camera to subject, the _ depth of field
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greater
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What is depth of focus?
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tolerence in the accuracy in the seating of the lens; The distance on either side of the focal plane where the film or CCD can be seated and still
record an acceptably sharp image |
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What is perspective?
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The apparant size and depth of objects in the image.
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What is perspective affected by?
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Camera to subject distance
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What is the difference between the lens of the eye and the lens of the camera?
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the eye - focuses 2d image onto eye that the mind interprets;
the lens - focuses 2d image onto medium, subject to all factors like dof, image size etc |
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What is size constancy? *H
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A perceptual distortion that
causes a mismatch between how we see an image and how a lens records it |
Size is not constant when comparing how big something is to your eye and to the camera.
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What is hyperfocal distance?
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When the lens is set to this, dof extends from half that distance to infinity
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What is the relationship between format and depth of field?
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The bigger the format, the less depth of field you can achieve
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