Perhaps from the engineer's point of view, a crack is better than a dent which might damage the inner elements. Besides, few cameras and lenses are sealed so moisture might not be a problem.

regards,
Alan Chan

Possibly, but it's also more likely to crack.  So many examples... I've
seen so many K-series bodies with dents on the top plate from being
dropped that still worked perfectly.  I bought a Super Program off eBay
once that had a cracked top plate.  It didn't dent, just cracked.  For
digital, I'm currently using an old Canon S10, which has a metal body.
It used to be my Canon rep's demo camera, and its edges are covered in
many small dents, none of which affect its performance, only its
aesthetics.  Now there's no way to say for sure, but I suspect that some
those blows would have been strong enough to crack a plastic housing, and
once you get the smallest crack the whole integrity of the camera is
threatened, as moisture and dust can get in.

I'm not a structural or a materials engineer, so I'm speaking from a
somewhat ignorant perspective, but based on my experience I'd rather have
metal than plastic.

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