film-depth of field
TRANSCRIPT
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Optics and Depth of Field
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Your Lens
•Your lens is made up of curved glass that is moved when you focus and zoom
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Focal Length
• Focal length refers to the strength of magnification by a lens
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24mm
50mm
200mm
800mm
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Focal Length and Angle of View
• The Shorter the Focal Length the wider the angle of view
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Other features of focal length
• Short Focal length = wide angle– Wide angle lenses tend to distort objects
especially if they are close to the lens
• Long focal length tends to compression image
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Wide Angle Distortion
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Wide Angle Distortion
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Long Focal Length/Telephoto Compression
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Telephoto Compression
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Special Lenses
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Tilt Shift Lens
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Tilt Shift
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Tilt Shift
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Lensbaby
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Fisheye
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Fisheye
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Depth of Field
• The portion of a scene that appears sharp in the image
• A lens can precisely focus at only one distance, but the decrease in sharpness is gradual on either side of the focused distance
• Not easily perceived by the human eye
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Long/Deep Depth of Field Shallow Depth of Field
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Depth of Field is Controlled by Three Things
1. Aperture
2. Focal Length-zoom
3. Closeness of subject to camera
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Controlling Depth of Field with Aperture
• A low aperture (1.8 to 5.6) gives you low.short/shallow depth of field
• A high aperture (11-32) gives you a long/deep depth of field
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F 3.5
F 22
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Controlling Depth of Field with Focal Length
• Longer lenses tend to give you a shorter depth of field resulting in blurrier backgrounds
• Wider lenses are better at keeping more depth in focus
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Controlling Depth of Field with Proximity to Subject
• Similarly, the closer you are to the object the less depth of field will be present
• This is the same idea as focal length
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More Examples
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DOF
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Low DOF
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Low DOF
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Low DOF
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Low DOF
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Low DOF
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Long DOF
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Long DOF
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Long DOF
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Long DOF
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Long DOF