Requirement
3 photographs
Purpose
Explore how depth of field changes with aperture
Technical learning
- Wide aperture reduces depth of field, whilst a narrow one increases the range of sharpness in the image
- Each stop of halves or doubles the size of the aperture: f1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32
- For the same level of exposure shutter speed adjusts in inverse proportion to the change in aperture
Exercise instructions
Find a row of similar objects to shoot at an angle (e.g. railings, parked cars, terraced houses). Stand at an angle to the row of objects. Set up camera on tripod (for identical framing). Set the camera to aperture mode. Focus at a middle point and note down. Shot 1 - Set the lens to its widest aperture. Shot 2 - Set the lens stopped down to the mid-point of its range. Shot 3 - Set the lens to its smallest aperture.
Images and review
Using the 3 bottles of Fairy Liquid again for this exercise...
Nikon, 50 mm at f1.4, 5.6 and 16
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| f1.4 |
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| f 5.6 |
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| f 16 |
Review of photographs against purpose of exercise.
- Depth of field moves from narrow to broad as aperture becomes smaller
- I have marked the range of sharpness in the first (f1.4) and thrid (16) shots
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| f 1.4 |
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| f 16 |
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