Cameras with interchangeable lenses pose a problem -how to swap optics without allowing dust to enter both camera body and lens system….especially if you are shooting somewhere with airborne particles.
Today’s invention offers a solution, at least for high-end optical gear.
Starting to remove a lens would cause a small internal heater in the camera body to fire up briefly. This would pressurise the inside of the camera by a few Pascal over atmospheric pressure.
A gentle but steady puff of air would occur for a second or so through the lens attachment ring.
In this time, a new lens could be attached, thus minimising the amount of airborne grit etc which could get anywhere near the interior of the system.
The thermal effects on the optics would be not much more significant than those associated with photography on a hot day.