[Wolfgang]

Both were shot in Aperture priority mode at F22 iso 100 set manual focus to infinity and take a picture of a plain white computer screen. You can make one by opening a new doccument in photoshop or even paint. This is the important part. Line your camera up at the left side of the plain white computer screen about 3"-5" away and when you press the shutter it should be a fairly long exposure move your camera to the far right side of your computer screen. At this point you have your file on your card. Open the image in photoshop preferably and all of those black dots are dust on the sensor (unless you have a dirty computer screen).

The camera I bought was a floor model that someone stole the lens off of. So for more than a year it was just sitting out on the floor display at Best Buy without a lens. Dust and crap accumulating the whole time. Getting a $1200 camera for $499 was worth the time it took to clean.