Do you know the quality of NISI filters?
NISI is a young Chinese company that sell square and round filters and also his own aluminium holder.
They are using Scott glass like B&H or Haida, their thick filter design ring for the round filters are awesome and the filter catalog are huge, promising?
I will have some material from this company in a few days to do a review.... exciting....
If you want to see what this company offer, click in his logo.