Hi all, I received a Nikon D40 last Christmas but since then I've yet to realise its full potential. The dial has barely left 'Auto' I'm keen to understand the underlying principles but can't find suitable literature to guide me. I read a number of photography related magazines, but in all honesty I don't understand the technical details. What is aperture, what effect does it have? F whats? etc etc. Can anyone recommend a book or DVD that shows these principles in use? I suppose a workshop would be ideal but I just don't know think I have the time at the moment. Thanks.