Hi all, i get this pretty big spot/stain on all the pics shot with an 18-135mm on my nikon 200d. I tried to shoot out of focus and the spot looks as sharp as always. Then i thought of the sensor but the spot refuses to appear again when i change to another lens, or shooting without lens, so where is this damn spot after all. If there would be dust in between the glasses somewhere, shoudn’t it change sharpness, size, on the senzor, depending on focal length, focusing, etc? Any idea, anybody?