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No. Cleanliness is next to godliness, and godliness is next to good autofocus. Having a clean sensor will not be a detriment to autofocus algorithms.


On most DSLRs, focusing is done through a dedicated phase detect sensor which is separate from image sensor. As a result, autofocus is not impacted by anything you to do the imaging sensor. This image (source) shows the various parts of a DSLR: #2 and #3 are the parts of the mirror mechanism which fold away when creating the image. The light that enters the ...

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