ProMaster 67mm IRND8X (.9) HGX Prime – 3級

The individual grinding and polishing on this filter really shows—sharpness didn't drop off at all even when I stacked it with a polarizer. Dirt and smudges wipe off effortlessly, which is a huge plus for outdoor shooting.

Finally, a filter that doesn't introduce a color cast to my long exposures — the infrared suppression is a game-changer for keeping skies neutral. The ground glass feels noticeably smoother when screwing on, too.

I've been using this for long exposure seascapes and the IR suppression makes a real difference in color accuracy. The coating repels dirt well too, even after a windy day on the beach.