I got in on the Blackmagic Pocket Cinema Camera (bmpcc) fire sale and in preperation for receiving my new camera I have been researching neutral density filters.  What I would like to know is what are people's preferences between single ND filters and variable ND filters.  And also your thoughts on IR filtration for the bmpcc.   I already know if you go the "straight" variable ND route Tiffen seems to be a good trade off as far as quality and price.  Dave Dugdale did an incredible review of "s