If the spot shows up when that specific lens is mounted, but not when using other lenses, then it must be dust in the lens and not the sensor. Not many people realize this, but dust in the lens *can* show up on the image, depending on where it is located in the optical path, the focal length of the lens, the chosen f-number, and other factors. Essentially, when the DOF is very large, dust in the lens may be visible. Diffraction can even cause the spot to appear in the blur disks of the lens when taken wide open (but this is not what is happening in this case).


Do not attempt to vacuum the dust out. Not only will it fail to work, it may introduce more dust into the lens than you are trying to remove.


As for the Dust Delete function, it doesn