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Cambridge, MA 102310 Competitors take part in The Head of the Charles Regatta on October 23, 2010 in the Charles River. More than 20 nations took part in this year's competition. (Essdras M Suarez/ Globe Staff)/ MET BEHIND THE SCENE: It started as a beautiful crisp clear autumn day that kept getting colder and windier as the day progressed. So I just shot for about three hours. I had three cameras on me: one with my 24-70mm, another one with the 70- 200mm and the last camera had on a 300 2.8mm with a 1.4 extender. TECH STUFF: The light was so bright I shot everything at ISO 200, lens varied,and exposures were mostly on the fast side to capture peak action. MORE TECH STUFF: on the shots of the rowers with the bridge behind them I had to take control of the camera by putting it in manual mode and not my regular aperture priority mode. Had I stayed with the aperture mode the camera would have kept slowing down the shutter to compensate for all the dark areas in the background. However I knew I could add drama to the image by using a faster shutter speed and by exposing for the highlights. Remember cameras are so smart they are dumb.