Seems to do the job. I thought I would support NAFTA-based trade with our US neighbours,therefore went with Tiffen instead of with my favourite German or Japanese brands.
However, both filters I bought (in different sizes) came in unsealed, flip-open boxes that make it easy to drop the filter while opening the box. filters are free to float within the boxes, not being held by anything other than the friction of two thin sheets of some foam.
Despite being both brand new, one was nonetheless already generously smudged with fingerprints in the centre. Being no pixel peeper, I won't know for sure whether I just bought crappy filters; if they cannot pack them carefully, who's to say they are manufactured carefully. Now I know which brand I won't buy next time.