Winter Reflections, photo by Harold Davis. View this image larger.

I converted this image of winter reflections in Yosemite Valley to black and white using one of the simplest conversion techniques from a RAW original. The Grayscale Mix on the HSL/Grayscale tab of Adobe Camera RAW (ACR) does it all in only a few clicks, and provides a fair amount of control over the conversion. You can get good results this way quite quickly.