RAM stands for Random Access Memory and is the temporary storage in your computer. When you switch on it is there for you to work with your programs and files. But if you didn't save your work you would lose your files as RAM loses its contents when the computer is switched off. So that's why you have a hard disk, where all your hard work is kept. The more RAM you have the quicker your programs will start up and carry out calculations but this also depends on things like processor speed and other components. Will I mention it?....ok, you twisted my arm... FSB. I would like to suggest a camera in your price range but no I won't as I always suggest the wrong one, so I've stopped doing that. Look at the various manufacturers sites, join a few online forums and check out reviews, use or borrow a friend or work colleagues etc.

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Cinematographers do it with a telephoto lens.