Hoya W-IR800

The 3mm thickness feels solid, and the 25mm size sits snugly in my filter holder without any light leaks. Exposed shots come out with that deep IR glow I was after, and the glass is optically clean right out of the box.

The 25mm diameter fits my lens thread perfectly without any adapter hassle, and the 3mm thickness makes it easy to handle when swapping filters in the field. Infrared shots come out crisp with that deep black glass look once you dial in the exposure.

The 3mm thickness feels solid and well-made, and it fits perfectly in my filter holder for infrared experiments. Cuts out visible light exactly as needed, giving me clean IR shots without any haze.