Also, be extremely careful where you use it and where you change the lenses.
For example, if you do a lot of outdoor photography (standing in the surf or on a windy beach) expect your sensor to get dirty very quickly--especially if you change lenses while you're out there.
Unfortunately, the mere action of the shutter itself is slinging dust all around in there, so if you're taking hundreds of photos, it's something you have to learn to live with and Photoshop is your best friend, as MM points out.
The alternative is to used a sealed camera (which have become viable alternatives in quality to primes and zooms) or one of the newer models with a self-cleaning sensor (but I've never had any experience with one of those, so I don't know how well they actually work).
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