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This question already has an answer here:

Why is it that DSLRs makes more bokeh from far objects compared to near ones (Large apertures)? How camera sensor (or lens) function to take this shots?

EDIT:
My question is different as in the link above it says aperture is same on both APS-C and the other. My question is how bokeh is generated on DSLRs?

EDIT 2:
How should I explain this? The second question mentioned in above links tells something like:

Wide aperture lenses give you a shallower depth of field

And similar explanation. But I need the theory behind it that camera uses to blur subject. For instance why wide aperture gives shallower depth of field. What makes it shallow and how? In which part of the camera this happens?

marked as duplicate by James Snell, mattdm, Philip Kendall, Dan Wolfgang, inkista Dec 7 '15 at 19:07

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Follow this link: This effect is called "Bokeh" https://en.wikipedia.org/wiki/Bokeh

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

  • Please edit this answer so it's more than just a link - we strongly prefer answers to be self-contained. – Philip Kendall Dec 7 '15 at 16:54

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