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Optics and Depth of Field

Depth of field

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Page 1: Depth of field

Optics and Depth of Field

Page 2: Depth of field

Your Lens

•Your lens is made up of curved glass that is moved when you focus and zoom

Page 3: Depth of field

Focal Length

• Focal length refers to the strength of magnification by a lens

Page 4: Depth of field

24mm

50mm

200mm

800mm

Page 5: Depth of field

Focal Length and Angle of View

• The Shorter the Focal Length the wider the angle of view

Page 6: Depth of field
Page 7: Depth of field

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

Page 8: Depth of field

Wide Angle Distortion

Page 9: Depth of field

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

Page 15: Depth of field

Tilt Shift

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Fisheye

Page 17: Depth of field

Fisheye

Page 18: Depth of field

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

Page 22: Depth of field

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

Page 23: Depth of field

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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Page 27: Depth of field

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