Who has great lenticular filters and the best filter replacement

I am looking at filtration setups and it seems rhat lenticular filters are a go to in the scene. Who makes great lenticulars and has good filters for it. Thanks everybody.

Leitz and Pall heraus are good brands
But the Chinese make Some decent filter housing and cartriges


Ty. Il be taking a look at a lot of options

Whats the smallest micron in the stack that works the best.