Promaster 52 mm IRND1000X (3.0) HGX Prime

I was worried about infrared color cast with long exposures, but this filter suppresses it perfectly—my sky stayed clean blue even at 30 seconds. The ground glass feels noticeably sturdier than my old coated filters.

I've been using this filter for long exposure seascapes and the infrared suppression is noticeably better than my older ND filters—no more weird color casts. The individual grinding and polishing really shows in the sharpness, even when stacking with a polarizer.

The coating on this filter really does repel dirt—after a dusty shoot, a quick puff of air left it spotless. My long exposures came out with no color cast, which was my main worry with an IRND. For the price, the build quality feels premium.