One of the neat things you can do with digital cameras is create animations from a series of exposures taken in succession. This image of (from left to right) the 36" Spacwatch dome, the 90" & the 4-meter dome on Kitt Peak, is from one such series. The mountain top and domes are illuminated by a 1st quarter moon, while the clouds in lower center, depressingly, are illuminated from the ground, near Phoenix. Note that the Space Watch dome was rotating during this exposure. Canon 20D - 30 seconds, 20mm @ f/1.8, ISO 400