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This question already has an answer here:

How do I take a picture with a blurred background with my canon eos 70D using the 18-55 mm lens

marked as duplicate by Philip Kendall, Hugo, mattdm, inkista, Dan Wolfgang Apr 1 '15 at 23:25

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Use the maximum zoom, the lowest F-number and get as close as possible to the subject you want to photograph. This will minimize the depth of field.

  • Short, but verey specific anwer :o). There is almost nothing else you can do in the camera but this 3 points mentioned. – Rafael Apr 1 '15 at 22:05
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This is a usually situation for portrait. The important is make the most short possible the dept of field in your lens and this you will do controlling the aperture. Because your question, I guess you are new in photography and I think you must read some theory for you can enjoy better your excellent camera.

Concretly:

  • set the camera in Av. this will let you control the aperture and the camera will adjust the speed.
  • set the minimum F number your lens offer you. Big F number close the diafragm, less light come to your sensor but more depth of field you will have and subject and background will be in focus. It is the oposite you want, so, go to the small number :)
  • zoom and make the composition of your photo
  • important: when zooming the F number will change, maybe at 18mm you will have 2.8 but at 55mm you will have 4.5 because the focal length affext the aperture.

Other details:

  • you didn't ask, but the focus mode is important: if you will shoot to some subject moving with short depth of field will be more complicate get the right focus
  • if is a portrait, the focus go to the eyes of the subject
  • if you can get other lens, I recommend around 70mm for portrait. Go little far from your subject and zoom in, with small F numbers (big aperture) you will have the best results
  • be carefully with flash! You will have big aperture, and white people with a strong light can 'burn' the picture
  • REMEMBER: big aperture == small F number, small aperture == big F number. You will use the first case.
  • Can I ask where are the mistake in my answer? – HEDMON Apr 10 '15 at 13:30
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Depending on your situation, you could also do a long exposure like 1/2 a second or longer.

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    That's going to blur everything, not just the background. – Philip Kendall Apr 1 '15 at 20:51
  • @PhilipKendall Kendall Unless your subject sits still.. – SailorCire Apr 2 '15 at 10:22

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