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Watch out for this gotcha! It caught me out - so a warning, just something to bear in mind. I was using a Fuji X-E1 and 18-55mm lens but it will probably be a risk with any mirrorless camera especially with wide-angle lenses that have a rear element that comes close to the sensor. I took some photographs on a misty morning and when I processed them I discovered large shadowy smudges down one side easily visible with the large areas of flat light grey. I thought it was dust (but looked a bit odd) or a mark on the sensor but I could not see it with magnification and cleaning achieved nothing. The smudges could even be seen through the viewfinder at f22 against a hazy sky. Turned out to be a greasy mark on the rear element (actually it looks more like a cover glass to keep dust out) of the 18-55mm lens. With the small back element to sensor distance on mirrorless compact system cameras it was only just out of focus on small f-stops and therefore visible in the image. With a dslr I suspect it would not have been visible. So check the rear element before cleaning your sensor! And keep the back element clean, I must have just caught it when changing lenses. See the effect here, just to left of watermark.
