NiSi ATHENA フルスペクトラム FS ND 1.2（4ストップ）ドロップインフィルター ATHENAレンズ用

The 4-stop reduction is exactly what I needed for shooting wide open in bright sun, and the drop-in design makes swapping between filters effortless. It's sharp with no color cast that I can notice, even when stacking with a polarizer.

Was a bit nervous about drop-in filters messing with my setup, but this one slides in clean and doesn't shift the image at all. The 4 stops let me shoot wide open in harsh noon light without clipping, and it's been solid on a whole weekend shoot.

Finally, a drop-in filter that doesn't shift the color cast on my footage — the 4-stop light reduction is exactly what I needed for bright outdoor scenes without sacrificing depth of field. It slides in effortlessly and feels solidly built.