There were scattered ground blizzards roaming Yellowstone's Lamar Valley during a visit in Dec. 2008. This image was made by waiting about 30 seconds for one swirl of snow that looked like it might reach this group of cottonwood trees. While I didn't change lenses, I did adjust the focal length of my zoom, so that may be a technical violation of my own rules.

I didn't have to move, only rotate slightly. (5D, 24-70 f2.8 @ 66 mm, 1/125 s, f/10, iso 200, +2/3 EV)
Comments
6 commentsA very good example of how changing the focal lenght can add drama to the image. Very well done.
Mauro
Ray