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Message: <blockquote data-quote="480sparky" data-source="post: 417577" data-attributes="member: 15805"><p>Even if you mount a lens on a camera body the day you buy them and never remove the lens, you will still get dust into the camera.  Lenses and cameras are not manufactured in a clean room and are not hermetically sealed before packaging.  As soon as you focus or zoom a lens, air gets moved in the lens.  Elements need to move in order to focus or zoom.  Air is pulled in, and air gets pushed out.  Air-borne dust will follow along for the ride.  And air gets moved in and out of the mirror chamber as well, along with it's attendant dust.  Some lenses are known for excessive 'eye blow', pushing lots of air out the viewfinder and into the user's eye. Eventually, that dust will be attracted to the sensor.</p></blockquote><p></p>