Question by kirr45: Another aperture question?
I asked a question related to aperture and how it affects “blurriness”. I had trouble understanding the concept that depending on the aperture, a picture can become blurred. The reason I don’t understand this is because isn’t this the job of the focus on the lens? Doesn’t the focus on the lens allow you to adjust focus on where you want it. For example if you want to do a portrait and blur the background, wouldn’t you just adjust the focus? Why would you need aperture to blur it?
Answer by fhotoace
You do not understand the relationship between the aperture and depth of field. Wide open produces a shallow depth of field, something portrait photographers use all the time. A lens that is stopped down to say f/16, will provide a larger depth of field. However there is a forth component. The length of the lens. A wide angle lens provides more depth of field at any aperture than a long lens shooting at the same aperture.
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