A DSLR imager can make do without a computer, relying on the camera's memory card for storage and the viewfinder for focusing. That's a way to get started, but it's not a recipe for getting the best out of a camera. A computer isn't just nice for modified webcams and CCD cameras, it's a necessity. What's required? A laptop is the best and safest choice. It need not be the latest laptop, however, since most imaging software, unlike some planetarium software, is not demanding of computer resources. What's most needed is, as for a webcam computer, plenty of storage space. Unless the camera in use has a very small chip, many megabytes of data will be accumulated from a single evening's observing run. A minimum hard drive size of about 80 GB is desirable.
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