About three months ago I was driving home from somewhere up North. It was late in the afternoon on an overcast Spring day. I drove up one of the little curving switchback hills over which State Highway 1 winds North from Dunedin and saw the dark clouds part and a single crepuscular ray of light pick out a distant hill. Under a billowed flannel grey sky the earth was the bright light green of newness and growth. I stopped the car and got out my camera. The ray of light glowed straight edged and several sided; perfect. I knew it would disappear as the gap in the clouds above it closed, so I had maybe a minute to get the shot. Crepuscular rays, "God beams", are hard to capture. I extended the zoom all the way out, set the aperture as wide as it would go - at that distance there weren't going to be any depth of field problems and I wanted as fast a shutter speed as possible to obviate camera shake in the fading light. Of course I could have just knocked the ISO up a coupl...