The Whipple Observatory 10m Gamma Ray Telescope is located at an altitude of over 7000 feet on Mount Hopkins the 2nd highest peak in the Santa Rita Mountains, about 40 miles south of Tucson in Southern Arizona. The optical reflector is of the Davies Cotton design and comprises an alt-azimuth-mounted 10 metre dish holding 248 mirrors.

During the summer months of 1999, the camera on the Whipple Observatory 10m Telescope was upgraded from the previous 331 pixel camera (shown later) to a finer resolution 490 pixel camera comprising 379 half inch and 111 one inch photo multiplier tubes.

From the summer of 1997 until the summer of 1999, the camera on the Whipple Observatory 10m Telescope comprised 331 one inch photo multiplier tubes.

Mount Hopkins on March 7th, 2000: the morning after quite a heavy (by Arizona standards) snowstorm. There was about 15 inches of snow on the ground.

Sunsets can be spectacular in Arizona. The picture of the 10m telescope with the sun setting behind it.