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An excellent and informative tutorial on using DSLR cameras to acheive this effect can be found at:
• DSLR Tips: How to blur backgrounds on port...
Short-cut keys:
p = paintbrush tool
x = toggle foreground/background colour
[ = decrease brush size
] = increase brush size
ctrl+I = invert selection
ctrl+Z = undo last action
ctrl+F = repeat last filter action
ctrl+shift+A = deselect all
shift+Q = Toggle quick mask