Post on 18-Feb-2017
Photography Workshop John Pheasant IAAP Tuesday 23 February 5 – 6 pm
Photography workshop: Intermediate
¡ GeBng to know you
¡ Taking control of your photography ¡ Aperture and depth of field ¡ ShuHer speed and sense of moIon
¡ PracIcal
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GeBng to know you
¡ How long have you been taking photos?
¡ What do you like to photograph?
¡ What camera do you have?
¡ What would you like to learn in this workshop?
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Taking control
¡ Point and shoot cameras ¡ You point but the camera does the interesIng part
¡ SLR and DSLR cameras let you take control ¡ Let’s look at two essenIal ways of taking control
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Photography basics: revision
¡ What controls your exposure?
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Photography basics: revision
¡ What controls your exposure?
¡ Aperture
¡ ShuHer speed
¡ SensiIvity of the sensor or film
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Photography basics: revision ¡ What controls your exposure?
¡ Aperture: the size of the hole through which light enters the camera
¡ ShuHer speed: the length of Ime during which light enters the camera
¡ SensiIvity of the sensor or film: the amount of light needed to record the image
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Photography basics: revision
¡ Aperture: e.g. f/2.8
¡ ShuHer speed: e.g. 1/500 sec ¡ SensiIvity of the sensor or film: e.g. ISO 100
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Photography basics: revision ¡ There is a mathemaIcal relaIonship between
¡ Aperture
¡ ShuHer speed
¡ SensiIvity of the sensor or film (ISO)
¡ At the same ISO, halving the aperture requires the Ime the shuHer is open to be doubled to make the same exposure
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Aperture and shuHer speed ¡ Apertures
¡ Smallest to largest (called ‘stops’) ¡ f/32, f/22, f/16, f/11, f/8, f/5.6, f/4, f/2.8
¡ ShuHer speeds ¡ Fastest to slowest ¡ 1/1000 sec, 1/500 sec, 1/250 sec, 1/125 sec, 1/60 sec, 1/30 sec, 1/15 sec, 1/8 sec
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Aperture and shuHer speed ¡ The same exposure can be made with different combinaIons of aperture, shuHer speed and ISO, e.g. ¡ Aperture: f/2.8 ¡ ShuHer speed: 1/500 sec ¡ SensiIvity of the sensor or film: ISO 100
¡ Will give the same exposure as ¡ Aperture: f/4 (aperture halved) ¡ ShuHer speed: 1/250 sec (Ime shuHer is open doubled) ¡ SensiIvity of the sensor or film: ISO 100
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Aperture and depth of field
¡ Aperture ¡ also controls depth of field (how much of the photo is in focus)
¡ The smaller the hole, the greater the dof ¡ The larger the hole, the shallower the dof
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Aperture ¡ The larger the hole, the smaller the aperture number
e.g. f/2.8, f/5.6 ( = faster shuHer speeds)
¡ The smaller the hole, bigger the aperture number
e.g. f/11, f/16 ( = slower shuHer speeds)
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Depth of field ¡ Everything in focus? ¡ Specific subject in focus?
¡ How much depth of field?
¡ Depth of field and low light photography
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Depth of field: shallow
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Depth of field: less shallow
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Depth of field: portraits
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Depth of field: portraits
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Depth of field: low light ¡ Greater depth of field = smaller apertures (e.g. f/11, f/16)
¡ Smaller apertures require the shuHer to be open for longer
¡ Slower shuHer speed increases risk of hand shake (blurring)
¡ SoluIon?
¡ Increase ISO
¡ Tip: use auto ISO and set minimum shuHer speed
¡ Allows photographer to vary aperture (dof) without blur
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Depth of field: low light ¡ But!
¡ Higher ISO (e.g. 800, 1600) = ‘noise’
¡ ‘Noise’ is a grainy effect in the image
¡ Tip: use lowest ISO as possible (e.g 400 rather than 800)
¡ With higher ISO: reduce noise in ediIng
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ShuHer speed ¡ The faster the shuHer speed, the sharper the image (less hand shake or blur)
¡ But, if you slow the shuHer speed, you can create a sense of moIon
¡ For long exposures (1/20 sec and slower), use a tripod
¡ Panning
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ShuHer speed: moIon
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ShuHer speed: moIon ¡ This photo was taken at 1/60 sec
¡ At this shuHer speed, the red spokes of the wheel are slightly blurred
¡ This conveys the moIon
¡ The focus is on the inner mechanism pulping the sugar cane
¡ Aperture f/5
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ShuHer speed: water ¡ Long exposures (very slow shuHer speeds) will smooth water and give a dreamy effect
Copyright 500px
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ShuHer speed: waterfalls ¡ Long exposures (slow shuHer speeds) create a sense of flowing water in rivers and waterfalls
Copyright deviantart
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Select aperture or shuHer speed ¡ Never use auto
¡ Select aperture seBng: you control aperture, the camera sets your shuHer speed
¡ I recommend this seBng for most photography
¡ For moIon, select shuHer speed: you control shuHer speed, the camera sets you aperture
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PracIcal
¡ Let’s get you taking some photos!
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