If you have a DSLR camera and change the lens on it, one of the advantages of a DSLR, there is a chance you can get dust into the camera that can end up on the sensor. If you get dust on the sensor, well you can guess, it can appear on your images. If you get dust on your lens you can simply clean it off. With a sensor that is a bit trickier. You can do it yourself but if you’re like me you might prefer to get someone to do it for you.
Here is how you can check to see if you have dust on your sensor.