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hi Mike,
Yep read all the reviews about a thousand of them, some have said they had a problem and some have never had a problem and the ones that did have the problem worked in dusty conditions that really isn't recommend for any type of imaging if you want to look after your lens's.
It was a choice between the sigma 50-500 or the canon 100-400 and seeing my mate has the Sigma 50-500 which I didn't like the choice was easy.
But like you said care needs to be taken and common sense.
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