Pretty good article there.
1. Notes on working for clients:
-changing something you worked on 2 hours can be very tiring
-instead make the composition first with "cheats" so you dont need to waste time
2. "in real life there is hardly any pure light and pure dark"- Shaddy Safadi (seems to be true for outdoors, indoors there is pure dark, but not pure white, like paintingiscool pointed out)
the dynamic range defines the range of light going into the camera. naturally the light hits the sensors in a linear fashion, so having 2 different expostures for light and shadows or tone mapping could help getting an accurate lighting (not properly researched, information could be wrong)
4. very simple and good tutorial on shooting hdr photos with canon 600d http://www.hilomedia.com/portfolio/prod ... rebel-t3i/
clipping refers to the range in the shadows or lights that gets lost by wrong exposure