Hello this is my first post. I just bought a nice new d80 after a using the canon is3 for a few years. I'm having some difficulties getting sharp photos. I understand the general rule that for hand holding a shot, your shutter speed should be at least equal to your focal length. What about while using a zoom lens. My current lens is a 18-135mm. If I were to shoot a subject at 28mm, should my shuttterspeed be at least 1/30th or does it need to be what the maximum focal lenth of the lens is? So even though I'd be shooting at 28mm I would need to be at 1/160th. Also is this rule the same for flash photography? Thanks for any help you can offer. The learning curve is steep from my old point and shoot!