Desert Botanic Garden  Phoenix

Glowing saguaro at night 

Alligator tree, Granite Basin

Prescott, Arizona

Dead trees, Prescott

Chong Ho Yu 2009

Cactus dog, Prescott

The first two photos were taken at Desert Botanic Garden, Phoenix with the guidance of Wilson Wyatt. I knew that a long exposure exceeding 30 seconds in a digital camera would lead to sensor overheating and digital noise. Before going to the garden, I searched my house for my film-based cameras and at last I found the good old Nikon N8008. At first the camera appeared to be functioning, but at the garden the Nikon quitted working. I had no choice but sticking with my digital camera. As I expected, every time after taking a long exposure, the LCD showed this message: "sensor is overheated; allow it to cool down." If you have put aside a camera for a decade, don't be surprise if it is not working!