ProMaster 72mm IRND1000X (3.0) HGX Prime – 10 stops

I was worried about IR pollution ruining my long exposures, but this filter's IR suppression keeps the blacks clean. The multi-coating also repelled water droplets during a damp morning shoot, saving me from constant cleaning.

The color cast is virtually gone compared to my old cheap ND, and the fact that it's ground and polished rather than just pressed makes the image look noticeably cleaner. Dirt and fingerprints wipe right off the coating, which is a huge relief on a hike.

I was skeptical about how much difference ground glass could make, but the clarity through this 10-stop filter is noticeably better than my old pressed one. It's cut down my long exposure editing time significantly.