If you begin to notice dark specks in your photos when you're using a digital SLR don't become alarmed and wonder if you will need to shell out more money for a new camera. The problem is simply dust on your sensor. When you switch lenses on an SLR it is easy for dust to get inside the camera and settle on the sensor, which will, in turn, create small dark spots in the pictures you take.
Your camera may already have a built-in sensor-dusting function, but most cameras will still require a careful manual cleaning.
1. Purchase a self-cleaning SLR.
Dust specks that collect on the camera sensor can create dark spots on your photographs. If you are unsure if you have this problem already you can enlarge your photographs or take a picture of a white wall.
Olympus's E1 and Evolt E-300 SLRs have what the company calls a Supersonic Wave Filter built in. Every time you turn the camera on or activate the filter, it vibrates the sensor to shake dust off. The dust is then collected on adhesive strips along the sides of the sensor. In our experience, this system works pretty well. It's a pity other manufacturers don't offer something similar.
2. Clean your camera with care. If you don't have one of the cameras mentioned above sooner or later you'll need to clean your sensor. You can always send it to the manufacturer for a professional cleaning if you're apprehensive about doing it yourself. Regrettably this option is not a very practical or cost effective way to handle the problem every time you seen a new spot. Although you need to always be careful, the best answer to the problem is to clean the dust yourself.
Most sensors have a protective glass covering, and unfortunately if you scratch or damage it, there's a good chance the manufacturer's warranty will not cover repairs. Try not to be casual about what you put inside the camera. A note: never blow compressed air into your camera. Compressed air uses propellants that can leave a residue and create a film over your sensor.
You want to find products that are made specifically for sensor cleaning, usually through any retailer who sells digital cameras. You can find a variety of products available from manufacturers such as Photographic Solutions and Visible Dust. Speck Grabber from Kinetronic's is a great product as it has a little light built in which is helpful for getting at particular bits of debris. If you own a Kodak camera you can use the Kodak sensor-cleaning kit which also comes with its own detailed instructions on how to clean camera sensors.
When you have purchased your product and are ready to clean the sensor you need to put the camera into sensor-cleaning mode so that the sensor is exposed (check the manual about how to do this with your particular model) and remove the lens. Use should use a bulb blower to blow dust off the sensor (you will want to make sure you hold the camera up so that the dust falls out instead of settling inside again). Carefully follow the instructions of the cleaning product you've chosen. This typically involves carefully swabbing the surface of the protective glass over the sensor.
To check that you have gotten rid of all the dust take a picture of a blank wall or piece of paper. Look at it at full size on a computer monitor and see if you can detect any remaining specks.
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