Digital camera is a very sensitive equipment.. coz it has thousands of optics and electronics parts… some are miniature. Precision and calibration of the optics and electronics is very important. Even with little displacement of the alignment between the optics parts, it will create major issue on the picture quality taken. And when this happen, you can’t simple adjust or re-align the parts using your bare hand and eyes… it’s going to need a big operation… and not simple operation coz only repair cameras professionals with the right tools can do it! And that will cost you money… probably lots of money!
But how much knock can your camera take before it really fail to function?… How tough is your Canon or Nikon? I have sent my lens for repair once… the lens fault was caused by many hard lens-creep throughout the years! I really hate lens-creep!!! I’m not sure how easy or where is Nikon repair or Kodak camara repair & service centre in my place… coz I don’t own Nikon or Kodak 
But if you own a Nikon or Kodak, I’m sure you know how to find them… Just the way I know where to repair my Canon… 
OK back to the question of how tough is your camera… someone actually did a test… a sick and kinky test on cameras!!! He tortured a Canon 400D and a Nikon D70.
Here is the video of the test… although the video’s title is Nikon D90 vs. Canon 550D, the test is actually conducted on Canon 400D and Nikon D70… check it out… once you finish watching the video, you will never scared knocking your camera again…
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