Excerpt: Acquired this with a Rokinon 35mm T1.5 for use on BMPCC. It does what it's supposed to do! Plus, even though it's not specifically called out as IR filter, I don't see any color cast in the BMPCC images. Can't comment on long-term ruggedness or stability.
Excerpt: I have been using stacked neutral density filters to obtain a variety of densities. This is sooo much easier. One simple twist and my shutter speed move from fast to a crawl and then back again.