Thanks... and interesting stuff!... big thanks for the McCullin link = )
Here's one for you... very touching interview...
http://news.bbc.co.uk/today/hi/today...00/8492777.stm
I'll try Exposure lock...
At the moment I spot meter the brightest highlight of the composition in camera, set the exposure to compensate for that, then focus, focus lock and recompose and shoot...