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A presentation for Kelso Camera Club

A presentation for Kelso Camera Club. by Norman Dodds. What is depth of field?. Depth of Field is the amount of a photograph which is in acceptably sharp focus from the foreground to the background. Why is it useful to understand depth of field?.

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A presentation for Kelso Camera Club

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  1. A presentation for Kelso Camera Club by Norman Dodds

  2. What is depth of field? • Depth of Field is the amount of a photographwhich is in acceptably sharp focus from theforeground to the background

  3. Why is it useful to understand depth of field? • It allows a photographer to control the amountof the photograph which is in sharp focus toenhancethe effectiveness of the image

  4. Everything in focus

  5. Main subject in focus – background blurred but recognisable

  6. Main subject in focus – background totally blurred

  7. What influences depth of field? • The focal length of your lens: • wide angle lens = more depth of field • telephoto = less depth of field • The distance from the subject: • further away = more depth of field • closer = less depth of field • The aperture of your lens

  8. Aperture • Aperture is the opening in your lens which lets in lightreflecting from your subject • Aperture is measured in f stops. Typically lenseswill have apertures from f2 to f36 • Just to confuse, large apertures have small numbersand small apertures have big numbers!

  9. Aperture • Each aperture allows in half or double the amount of light as you move up or down the f stops • Your camera may also be able to move up and down the scale in smaller steps with 2 or 3 positions between the ‘official’ f stops • Aperture has a significant impact on depth of field: • A large aperture will give a small depth of field • A small aperture will give a greater depth of field

  10. Why does aperture affect depth of field? • The explanation is a little bit technical: The non-technical explanation is simpler - it just DOES! That works for me!

  11. F 5.6 1/3200 small depth of field

  12. F 11 1/1000 medium depth of field

  13. F 36 1/80 large depth of field

  14. How do you work out what the DoFwill be? • There are 5 possibilities: • Ignore it – don’t worry…. be happy! • Use the depth of field preview if your camera has one.This provides you with a visual check • Use the depth of field scale if your camera has one

  15. How do you work out what the DoF will be? • There are 5 possibilities: • Ignore it – don’t worry…. be happy! • Use the depth of field preview if your camera has one.This provides you with a visual check • Use the depth of field scale if your camera has one • Use a depth of field calculator

  16. Get this online

  17. How do you work out what the DoFwill be? • There are 5 possibilities: • Ignore it – don’t worry…. be happy! • Use the depth of field preview if your camera has one.This provides you with a visual check • Use the depth of field scale if your camera has one • Use a depth of field calculator • Make an educated guess!

  18. Hyperfocal Distance and Focussing • The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. • When the lens is focused at this distance, all objects at distances from half of the hyperfocaldistance to infinity will be acceptably sharp.

  19. Hyperfocal Distance and Focussing • There are three ways to set your focus to the hyperfocal distance: • Use the scale on your lens – if you have one!

  20. Hyperfocal Distance and Focussing • There are three ways to set your focus to the hyperfocal distance: • Use the scale on your lens – if you have one! • Use a chart Get this online

  21. Hyperfocal Distance and Focussing • There are three ways to set your focus to the hyperfocal distance: • Use the scale on your lens – if you have one! • Use a chart • Guess!

  22. Using depth of field • Set your camera mode to AV - Aperture Value • Choose your subject and compose your shot • Set your chosen aperture • If you have a depth of field preview, use that to check the DoF • Check your shutter speed • If it’s fast enough – take the picture • If it’s too slow: • Use a tripod ……. OR • Increase the ISO until the shutter speed is acceptable

  23. Shutter Speed • Shutter speed determines the amount of time the lens remains open when you press the button • Similar to aperture, shutter speeds double or halvethe amount of time the lens is open as you clickthrough the different speeds • A photograph’s exposure is set by a combination of shutter speed and aperture • Shutter speed has no impact on depth of field

  24. Finding out more • Google ‘depth of field’ • Dofmaster website

  25. Questions?

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