If you use a DSLR you will probably be familiar with the problem of sensor dust. You will be familiar with the scene, you have just taken the worlds greatest picture, your rush home excited and plug the card into your computer. The picture flashes up on the screen and there it is your masterpiece… ruined by lots of ‘out of focus’ odd shaped dots, you moment of would be famed dashed upon the rocks.
Ok so maybe I’m exaggerating a bit, but you know what I’m talking about. Dust spots, irritating but they are a fact of life, when you change lenses on a DSLR if you are not careful and quick the tiny bits of dust that are flying in the air see your sensor exposed and make a beeline for it. Your picture can of course be retouched in Photoshop or the like and a regime of sensor cleaning is sensible and well worth the effort.
However here’s a mystery, and also an answer, how on earth does the dust manage to get on the sensor of a non DSLR. My friend Ivor was telling me the other day that he had sensor dust on his pictures from a non DSLR, a bridge camera if fact. I hear you ask how on earth…. well when you think about it there is a really simple reason. Bridge cameras and some compacts there is a fairly, in some cases an extremely, powerful zoom. My own Leica V Lux type 114, which I love, zooms from 25mm to 400mm for example. This is a problem for all makes however, when the camera is switched on the zoom springs into life and extends from the camera body, the more you zoom out to increase the focal length the further the lens extends from the body, got it so far? When you turn the camera off the reverse happens the lens shrinks back to the body, it’s like an optical trombone really. It’s also like a bellows sucking air in and out as the lens extends and retracts, so see what happens, tiny particles of dust are drawn in and settle on the sensor, mystery solved. That’s ‘how dust gets on the sensor of a non DSLR camera.
Every time I turn my camera off I wipe the extended lens barrel with a lint free cloth just to get rid of any troublesome bits and pieces that might be lying there temped to enter the camera. Its not a perfect solution but its got to help, give it a try..