Very useful info ... good to know and thanks for sharing.axtstern said:Cheap Trick No 5
If you own a Sigma 18-35 1:1.8 than throw the LCF 72 III lens cap away and buy any cheap 72mm replacement.
Why? look at the attached picture. The 18 little notches at both sides of the inner ring are sturdy and have extremly sharp edges. My lenses often take some punishment but the Sigma has now killed two expensive filters while being stored inside my Tamrac bag. It seems that any hard contact drives these notches into the filter glass and as it hits the glass on almost 18 places fairly distributed over the perimeter the filter does not only crack but shaters into several large pieces and a lot of fine splinters. So if you love your expensive filters, pair them with a proper cover.
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