K&F XK43 67mm Natural Night Filter
Exellent filter for the purpose of night sky, wide field Astrophotography. Very adept at cancelling light pollution and has a high quality feel. I can not comment on the coatings, but I had no problems with light refraction or ghosting, and the filter cleans easily. I would say an upgrade from filters like the ICE filters, and the added expense to go to those brands does not justify the cost increase.