Hoya W-IR800

The 12.5mm diameter fits my setup perfectly, and at just 3mm thick it’s easy to work with even in tight spaces. Glass is crystal clear with no visible haze, so I’m glad I went with this over cheaper plastic alternatives.

Finally have a solid glass IR filter that doesn't scratch like plastic—the 3mm thickness feels reassuringly sturdy. It threads on smoothly and holds focus perfectly with my infrared-converted camera.

Swapped my old plastic IR filter for this glass one and the difference in flare control is obvious. The 3mm thickness sits perfectly in my 12.5mm holder with no wobble, and hot spots basically vanished.