This is a poor quality CCD, it does not work well for Astrophotography purposes. Too often the image is unusable, the controls are inept, the instructions offered for it's use are worthless as they explain nothing, you will need to adept the installation onto any computer using Vista or W7 as the installation package offered is non compatible with those OS'.
This is attractive due to the reasonable cost, but it provides extremely poor images, is only useful on some of our solar system planets, does not work for DSO and will result in frustration, wasted time and you end up buying a good CCD.
Buy another CCD and avoid the Celestron Neximage CCD