مرشح NiSi 150x150mm Nano IR ND64 (1.8) 6 Stop

The 150x150mm size fits perfectly into my holder without any light leaks, and the nano coating makes cleaning off dust a breeze. Even with a 6-stop reduction, the image stays sharp with no noticeable color shift.

I was worried about color cast with a 6-stop filter, but this one keeps the blue of the sky looking natural. The glass is crystal clear even when stacked with another filter, and the holder is easy to slide into.

Finally, a 6-stop ND that doesn't shift my blues to purple. The 150x150mm size slides perfectly into my holder, and the glass feels much more durable than the resin filters I've been using.