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I know it must be IR. But what you use? Tiffen IRND? Some speak of Hoya being as good or better. Screw on or square? Screw on with step ring also ok? Thanks.
I use the Hoya ProNDs, 77mm screw ons. No complaints.
do they make a 4x4? cant find one
Here you go, SJX: happy reading! Kholi's posts were the reasons I got the Hoyas.
http://www.bmcuser.com/showthread.php?6403-ProND2-Now-Avail-Hoya-ProND-Rolling-Report-Thread
Based on the test shots in that thread, I decided I liked the look with ProND and without IR cut (unless shooting outside with no ND). And I'd say the Blackmagic cameras have more problems with IR contamination than the F35.
But maybe you could rent a few and test them out to be sure they're what would work for you--always the best course of action before laying down all the cash.
Same as my bro Hunter: I have old Arri PLs with 52mm threads, as well as Canons and such for my other cameras, so the 77mm with a step up ring is perfect for me. SJX, I think you'd want 2 at least to begin--maybe the 8 & 16 and then stack them for heavier ND if necessary?