Snow Tubing Action Picture

Two young snow tube riders deal with very-powdery snow.
 
This post-sunset shot represents the near-upper boundary of the Canon EF 70-300mm L Lens' low-light action capabilities. Since the light level was even and unchanging, I used a manual exposure. AI Servo combined with the center AF point (held on the kid's mid-torsos) took care of focusing and burst drive mode gave me a range of captures for each run down the hill.