Blackmagic Micro Camera was used on "I, Tonya"

[IronFilm]

You can very clearly see the BMD camera being used here at two and half minute in (not sure if they ever used footage from it, or if was only for VFX positional data):

 

 

[Matt Kieley]

They said at about 2:35 "we used six witness cameras synced to the timecode of the 35mm camera" which sounds like they were used for reference for the VFX. It's not totally clear but that's what I took from that. I just saw the movie tonight and I was sure it was shot digitally until I saw Kodak Film in the credits. The movie is great, by the way.