My teenage son has been keen on photography for years, but has just used his mobile phone and, more recently, a fairly basic Panasonic Lumix. I think he has a good eye for s shot, and a surprising amount of patience for somebody his age. Now, however, a friend has given him an old (1980s, I'd guess) Olympus OM1 film camera, complete with three lenses, one a telephoto. He's already shot off one roll of film and seems to be delighted with his new pride and joy. So, has anybody got any "golden rules" for using this classic camera, tips for good on-line sources of information about it, or even suggestions of good books for new users? Any pointers will be gratefully received.