Just watched some Ultra 16mm test footage on Vimeo. From time to time I saw letters and numbers flickering/running on the left hand side, rendering the footage unusable. These are obviously brand markings (or how these are called?) between the sprocket holes on single perf 16mm film stock - I remember these from all kinds of Super 8 and 16mm material for projection (reversal and print) - where these don't make any difference. I am thinking about Ultra 16mm in the future because a lot of older 16mm cameras seem to be way easier to convert to Ultra 16mm than to Super 16mm (say: Canon Scoopic, perhaps Beaulieu R16....). Q: does anyone know if the currently available 16mm film stocks (say Kodak Vision 3, Wittner 200D and perhaps Fuji Eterna Vivid - haven't seen any of the latter available on 16mm yet, but it is listed by Fuji) include these markings and ruin Ultra 16mm footage? Which film stock is to avoid and which is recommendable for that format?
Also: some Ultra 16mm footage seems to have issues with light leaks and scratches/marks caused by the gate or perhaps pin registration? Any tips regarding Ultra 16mm appreciated.
Thanks a lot in advance,