Aperture and focusing

Started Nov 11, 2012 | Questions thread
Dan Marchant
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Re: Aperture and focusing
In reply to Sungjune, Nov 12, 2012

Sungjune wrote:

Hello.

I have a question on a relationship between aperture and focus.

Put simply it is a hole, which can be made bigger or smaller. A bigger aperture (smaller f/number) allows more light to enter when the shutter opens. A smaller aperture (larger f/number) allows less light to enter when the shutter is open.

If an aperture is maximized or low f-number, then shouldn't be the picture all focused?

No, it is the opposite. You should Google/Read about "Depth of Field", which is a measure of how deep the area is that will be acceptably in focus. A large aperture (small number) will have only a narrow area in front/behind the point of focus. A small aperture (large number) will have a much wider area which is acceptably in focus.

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