(DOF) Focal Length
Getting of Auto Part 1
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Equipment – SLR Operation
Pentaprism
Viewfinder
Aperture
Sensor
Shutter
Lens
Reflex Mirror
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Equipment – SLR Operation
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Equipment – SLR Operation
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Equipment – SLR Operation
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Equipment – Sensor
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Equipment – Sensor
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Equipment – Lens
APS – C Sensor
APS – H Sensor
Full Frame Sensor
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Equipment - Lens
3
3
2
3
1. Lens Barrel
2. Aperture
3. Lens Elements
UD Lens
Fluorite Lens
4. Lens Mount
1
4
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Equipment – Lens parts
6
5
7
8
5. Zoom Ring
6. Focusing Ring
7. Distance Scale Window
8. Switch Panel
9. Focal Length Indication
7
9
8
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Equipment – Lens
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Equipment – Lens (Focal length)
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Equipment – Lens
APS – C Sensor
APS – H Sensor
Full Frame Sensor
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Equipment – Lens standard lens
- Standard lens has the same perspective as the eye
- Standard lens has a similar angle of view as the eye
- Any lens with a focal length shorter than standard – short focal length
- Any lens with a focal length longer than standard – long focal length
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Equipment – Lens angle of view
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Equipment – Lens angle of view
Angle of View with a short focal length lens
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Equipment – Lens angle of view
Angle of View with a long focal length lens
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Equipment – Lens angle of view
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Equipment – Lens angle of view
Angle of View EF lenses on Full Frame Sensor
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Equipment – Lens perspective
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Equipment – Lens aperture
Aperture controls two elements:
- How much light falls on the sensor
- Depth of field
F - number = Focal length / Aperture diameter
f4 = 100mm / 25mm
f16 = 100mm / 6.25mm
Example :
f2.8
f5.6
f11
THE SMALLER THE F - NUMBER THE LARGER THE APERTURE DIAMETER
THE LARGER THE F - NUMBER THE SMALLER THE APERTURE DIAMETER
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Equipment – Lens apertures
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Equipment – Lens apertures
Full or whole f – numbers:
1.0; 1.4; 2.0; 2.8; 4.0; 5.6; 8.0; 11.0; 16.0; 22.0; 32.0
⅓ f- numbers with the whole ones in red:
1.0; 1.1; 1.2; 1.4; 1.6; 1.8; 2.0; 2.2; 2.5; 2.8; 3.2; 3.5 4.0; 4.5; 5.0; 5.6; 6.3; 7.1;
8.0; 9.0; 10.0; 11.0; 13.0; 14.0; 16.0; 18.0; 20.0; 22.0; 25.0; 29.0; 32.0
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Equipment – Lens aperture
Fast Lenses
Slow Lenses
1.0; 1.1; 1.2; 1.4; 1.6; 1.8; 2.0; 2.2; 2.5; 2.8; 3.2; 3.5 4.0; 4.5; 5.0; 5.6; 6.3; 7.1; 8.0
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Equipment – Lens maximum aperture
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Mode dial
Creative Zone
Camera User settings
Basic Zone
Image Zone or PIC Styles
Mode dial
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Basics of Photography - Aperture
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Basics of Photography – Aperture
Full or whole f – numbers:
1.0; 1.4; 2.0; 2.8; 4.0; 5.6; 8.0; 11.0; 16.0; 22.0; 32.0
⅓ f- numbers with the whole f-numbers in red:
1.0; 1.1; 1.2; 1.4; 1.6; 1.8; 2.0; 2.2; 2.5; 2.8; 3.2; 3.5 4.0; 4.5; 5.0; 5.6; 6.3; 7.1;
8.0; 9.0; 10.0; 11.0; 13.0; 14.0; 16.0; 18.0; 20.0; 22.0; 25.0; 29.0; 32.0
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Basics of Photography - Aperture
Explain again that aperture controls two things:
1. Amount of light entering camera
2. DOF
Next slide is aperture funnel image
Next 2 slides closing and opening aperture
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Basics of Photography – Aperture controlling the light
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Basics of Photography – Aperture controlling the light
Going from f2.8 to f4.0 you are closing the
aperture by 1 stop resulting in halving the
amount of light coming into the camera
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Basics of Photography – Aperture controlling the light
Going from f11.0 to f8.0 you are opening up
the aperture by 1 stop resulting in doubling
the amount of light coming into the camera
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Basics of Photography - Aperture
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Basics of Photography – Depth of Field (DOF)
What is Depth of Field?
It is the zone of acceptable sharp focus both in front of and behind the
point of true focus
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Basics of Photography – Depth of Field (DOF)
What is Precise Focus?
Precise focus is possible at only one distance; at that distance, a point object will
produce a point image
Sensor
Lens
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Basics of Photography – Depth of Field (DOF)
What is Circle of Confusion (COC)?
Circle of Confusion (COC) is an optical spot caused by a cone of light rays from
a lens not coming to a perfect focus when imaging a point source. It is also
known as disk of confusion, circle of indistinctness, blur circle, or blur
spot.
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Basics of Photography – Depth of Field (DOF)
What is Acceptable Circle of Confusion (COC)?
Acceptable Circle of Confusion (COC) is the largest circle that is not perfect in
focus but indistinguishable from a point. The acceptable circle of confusion is
influenced by visual acuity, viewing conditions, and the amount by which the
image is enlarged. The increase of the circle diameter with defocus is gradual,
so the limits of depth of field are not hard boundaries between sharp and
unsharp. See below the accepted COC diameter for each sensor size:
APS - C
APS – H
Full Frame
0.019mm
0.023mm
0.030mm
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Basics of Photography – Depth of Field (DOF)
Precise focus
Focal Point
Sensor
Aperture
Lens Elements
Point of Focus
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Basics of Photography – Depth of Field (DOF)
Near point of focus
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Basics of Photography – Depth of Field (DOF)
Far point of focus
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Basics of Photography – Depth of Field (DOF)
Depth of Field
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Basics of Photography – Depth of Field (DOF)
Depth of Field
Far Point of Focus
DOF
Point of Focus
Near Point of Focus
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Basics of Photography – Depth of Field (DOF)
Three factors influences DOF
- Aperture
- Subject Distance
- Focal length
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Basics of Photography – Depth of Field (DOF)
Aperture – Focal length of lens is 35mm at f2.8
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Basics of Photography – Depth of Field (DOF)
Aperture – Focal length of lens is 35mm at f5.6
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Basics of Photography – Depth of Field (DOF)
Aperture
200mm @ f 2.8
200mm @ f 32
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Basics of Photography – Depth of Field (DOF)
Subject Distance - Focal length of lens is 35mm at f4, subject distance 1m
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Basics of Photography – Depth of Field (DOF)
Subject Distance - Focal length of lens is 35mm at f4, subject distance 5m
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Basics of Photography – Depth of Field (DOF)
Subject Distance
100mm @ f 8, 300mm from subject
100mm @ f 8, 410mm from subject
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Basics of Photography – Depth of Field (DOF)
Focal Length- Focal length of lens is 100mm at f2.8, subject distance 5m
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Basics of Photography – Depth of Field (DOF)
Focal Length- Focal length of lens is 35mm at f2.8, subject distance 5m
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Basics of Photography – Depth of Field (DOF)
Focal Length
50mm @ f 8
100mm @ f 8
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Basics of Photography – Depth of Field (DOF)
Focal Length – Same magnification = Same DOF
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Basics of Photography – Depth of Field (DOF)
Focal Length – Same magnification (size)
50mm @ f 8
100mm @ f 8
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