Bryce Lansing Posted May 29, 2010 Share Posted May 29, 2010 I got my Arri 1.2k HMI Par with magnetic ballasr, fully aware of the flicker issues. But now I'm a little confused... I read that 24fps at 180 degree shutter (1/48th) was flicker free, but that 23.98 at 180 degree shutter was unsafe.. So first I test the Canon 7d at 24p (which is really 23.98 right?) at 1/50th, and sure enough, rolling bars. 1/30th, 1/40th, and 1/60th looked fine. Then I tested my HVX200a, 24p (23.98 as well right?) at 180 degree shutter, and it from what I could see it looked completely fine. I know it has a global shutter so I wasn't expecting rolling bars, but it wasn't flickering at all either. Why is this? Is 1/48th a flicker free shutterspeed with the HVX? Or am I not seeing a very subtle flicker? Link to comment Share on other sites More sharing options...
timHealy Posted May 29, 2010 Share Posted May 29, 2010 where are you and what kind of electricity are u juic'in this baby with? Link to comment Share on other sites More sharing options...
David Winters Posted June 21, 2010 Share Posted June 21, 2010 I got burned with rolling bars on a Red One M shoot. 23.98 1/48th, shooting 2 passes of a scene to be compt'ed together. In the end we cleaned it up in post, but now I shoot a test, wide lens on a even light surface to verify. If I don't have time to test I shoot at 1/40th or 1/60th. Some cameras appear to be more sensitive vs others. I've never personally experienced rolling bar issues on 3-CDD systems at 23.98 1/48th, but I have had problems with rolling shutter CMOS cameras. However, most of the time it's so subtle that it's not an issue. Hope this helps. Link to comment Share on other sites More sharing options...
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