Hello to you all. I've a question that I'm hoping someone with a bit more experience of filters than I can help with. I've bought the PolarPro Cinema Series 6 pack of ND filters for my Spark earlier today via Amazon and one (ND8) seems to have what looks like either glue or at a stretch, potentially a crack on the underside of the glass. I've attached a photo which demonstrates it better than my description will. The pack is genuine - bought direct from Amazon rather than a marketplace reseller so exchanging shouldn't be an issue but would you expect something like this to adversely impact the resulting image/video quality given it's a filter rather than a lens or would it be a case of making a fuss about nothing? Unfortunately poor weather and probably time will mean I'm unlikely to get an opportunity to fly the Spark for a few days and they only have a couple of packs in stock. Appreciate your advice - thank you.