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# Photography: 3 - Shutter Speeds

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A quick recap on lenses - then some fun with shutter speeds!

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### Photography: 3 - Shutter Speeds

1. 1. Lenses are come in different sizes: <30mm = wide angle 50mm = what the human eye sees >70mm = Telephoto Zoom = Combines all three into one 24mm 50mm 70mm
2. 2. DOF refers to how much of a photo is in focus: The smaller the f-number, the smaller the DOF:
3. 3.  In your camera – between the lens and the film/CCD - is the shutter Video on next slide…
5. 5.  Think of it as a door that opens for a split second to allow the image of your subject to burn onto the film/CCD…
6. 6.  As the photographer you have control over how long this ‘door’ is open  Typically this will range from 1/1000th of a second (very, very fast) to 1 or 2 seconds (very slow)
7. 7.  The longer the shutter is open, the more chance there is that something in your subject will move, for instance… …the train appears still
8. 8.  But at a slower shutter speed the train has travelled an inch or so while the shutter was open… …so the train blurs
9. 9.  And at a very slow speed the train moves so much that it barely registers on the photo… …and becomes ghost-like
10. 10. Notice the blurred horses’ legs
11. 11. Faked with Motion Camera – Android phone app Not true motion blur Lo Res images (480x320)
12. 12. Notice the sharpness of the legs
13. 13.  If you use a shutter speed slower than 1/60th of a second your photos will suffer from camera shake (your hands can’t hold a camera that still for that long!):
14. 14. Slow Fast …or in old money…
15. 15.  For slow speeds you’ll need a tripod:  …or wedge your camera against something solid:
16. 16. Fast Shutter Speed Slow Shutter Speed
17. 17.  Either:  Set your camera to Shutter Priority mode and take a series of photos of the same moving subject at different shutter speeds  Or, if your camera does not have Shutter Priority, go to www.camerasim.com and experiment with the shutter speed slider
18. 18. A Quick Overview
19. 19.  Opening the shutter exposes the film/CCD to light  Too little light causes under-exposure, too much causes over-exposure:
20. 20.  You’ll remember that Aperture gives us Depth of Field by changing the size of an iris in the lens:  Think of the iris as a curtain that you can open or close
21. 21.  By opening or closing the iris you control the amount of light getting through it – just like closing a curtain to block out the sun on a bright day  This can be used to compensate for under or over exposure, so the iris can be opened (perhaps to f2.8) to let in more light when using a fast shutter speed, or the iris can be closed (f16) to let in less light with a slow shutter speed…
22. 22. Fast Shutter / Wide Aperture (f2.8) Slow Shutter / Narrow Aperture (f16)
23. 23.  This is the tricky part of photography to get your head around  We’ll keep coming back to it over the next few weeks >>>END<<<
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