No matter how careful you are about changing lenses and handling your DSLR camera, dust will eventually make it’s way inside and find a home on your camera’s sensor. If your camera has the buzz and shake feature(a.k.a. automatic sensor cleaning) it will prolong the need for a manual cleaning… but not prevent one.
Checking for a dirty sensor is a fairly quick and easy thing to do. Set your camera at ISO 100 or 200. Using f/16 in Aperture Priority (Av) mode, take a shot of a blue sky or white sheet of paper. To help see the dust easier try underexposing 1 stop and dial the lens completely out of focus. If your test shot shows a bunch of dark, fuzzy spots like the image below, you probably would want to clean your sensor.
To properly clean a sensor you’ll need a blower, swabs, cleaning fluid and a high-quality sensor “scope”. Sensor cleaning also takes a fair amount of experience… which is why most people have us do it for them. We offer same-day or next-day service, depending upon what time you bring your camera in. Cleaning of the external optics of your lenses is included in the price.