RICHARD HARRINGTON, PHOTOFOCUS:
"High Dynamic Range (HDR) photography has quickly grown into a popular form of photographic expression. It is both loved and loathed depending upon who you discuss the subject with.
"Many photography 'purists' oppose the technique and declare it to be unnatural or over-processed. Other photographers embrace it for its many benefits and opportunities.
"The perspective that matters the most, of course, is the audience’s ... they love HDR. The goal [here] ... is to help you understand the technical approach behind the photography and understand the limits of all digital cameras."
Read and learn, here.