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Re:Prague from the TV Tower - 18 Gigapixel Panoramic Photo by lutorm on Saturday December 19, 2009 @09:59AM (#1004803)
Actually, it's not that easy (to do well, at least).

18Gpix with a 9Mpix camera means 2000 exposures. Steady-state shooting rate for most digital cameras once the buffer is full is about 1 shot/s, so that means it would take at least half an hour. (And it's doubtful a robot mount could move that fast.)

During that time, the Sun will move significantly and unless you have a completely clear sky some clouds will likely move in front of the Sun. You'll never get a good stitch.

Re:Prague from the TV Tower - 18 Gigapixel Panoramic Photo by borism on Saturday December 19, 2009 @12:43PM (#1004918)
simple:

many professional cameras (20+ mpix) used by many photographers to take pictures of their appropriate sections