Instruct: Classify a given review as either positive or negative.
Query: Seems to be good quality, but mine arrived with dust on it

This seems to be a fairly basic cover for your expensive lens. Simply, this is good insurance. The optics looks perfectly fine to me. I can discern absolutely zero difference between photos taken with - and without - the filter applied. That said, the filter arrived covered in white dust and I was suprised that they didn't include a cheap lens wipe in the package.