BARABOO — Rescuers used the flash from a camera to locate an amateur photographer who had fallen in a boulder field Sunday night at Devil's Lake State Park.

The man, 29-year-old Zhang Ke of Madison, became lost and eventually fell about 15 feet below the Devil's Doorway Trail on the east bluff, said Kathy Crawford, spokeswoman for the Baraboo District Ambulance Service

"He had been hiking and taking photographs, and then he realized it was too dark for him to be out there," Crawford said. "He was trying to walk around on the trails. But there were no trails. They were completely covered (with snow)."

After about two hours on the phone with Ke, ambulance, fire and park personnel were able to locate him by spotting the flash of his camera.

Ke was not seriously injured but had developed hypothermia, for which he was treated at St. Clare Hospital in Baraboo.

The rescuers' four-wheel drive vehicle became stuck in the bluffs, so crews tied a rope to a tree and used it to walk Ke down the bluffs in a rescue basket, Crawford said. She added that the snow was waist-deep and wet.