Relation between dust and aperture setting

Started Mar 30, 2014 | Questions thread
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Re: Relation between dust and aperture setting
In reply to Photonique, Mar 30, 2014

The dust does not sit on the sensor. There is a Bayer filter and an AA filter sitting on the sensor with a coating above that. The dust is therefore separated from the sensor by a little distance.

The top section of the figure shows light focusing on the sensor from a small aperture with a small dust particle in the way and the bottom section shows light from a large aperture with a small dust particle in the way.

The small aperture produces a narrow cone of light and the large aperture produces a wide cone. For a given dust particle size, the dust will block more of the light in the case of the small aperture. That will make the dust more visible with small apertures. With wide apertures a lot of the light will get around the dust particle so the contrast will be lower and the dust will not be as easily seen.

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