View Full Version : Shooting 25fps with 60hz lighting . . .
Chris Oben
02-08-2009, 11:28 PM
Is it possible to set the RED shutter angle to exactly 150 degrees with a system frequency of 25fps?
Shooting in North America - U.K. Client wants 25fps for PAL post / delivery . . .
Dominic Jones
02-09-2009, 04:28 AM
Yes - you can certainly set the shutter to 1/60th in 25fps timebase. I can only assume the same is possible shooting in shutter angle mode... If you find it isn't (I'm sure you won't!), change to "normal" shutter mode and dial in 1/60.
Cheers,
Dom.
Paul Leeming
02-09-2009, 06:18 AM
No problem at all. We deal with this issue all the time here in Tokyo since the local frequency is 50Hz but all Japanese TVs are NTSC using 60Hz! Weird thing is in other parts of Japan they use 60Hz as their electricity frequency!
Just set your camera to 25fps and use 1/60th second as Dominic said.
HTH
Paul
Robert P. Hogue
02-09-2009, 09:49 AM
You just have to watch the phase problem - Is the electrical mains a single phase system like most homes, or a three phase system like many commercial buildings? If your lighting is not all on the same branch circuit, you might notice one zone flickers out of sync - this is the reason why on certain on location shoots, electricians will change ballasts to flicker-free ballasts. On a three-phase system, you might want to consider 1/180 sec shutter speed on 60hz systems, and 1/150th on 50Hz systems.
Dominic Jones
02-09-2009, 10:43 AM
Weird thing is in other parts of Japan they use 60Hz as their electricity frequency!
Hi Paul,
You should try shooting in Brazil mate - they've got 110v and 220v, both 50Hz and 60Hz, seemingly randomly from building to building!! Had to lug a f*cking great big two-way transformer around everywhere - on a documentary shoot, no less! In Salvador, I couldn't even get a stable enough circuit to run a battery charger after trying every available outlet on a whole street! (Lovely people though - you wouldn't believe the number of kind folk who let us try running extension cables out of their front rooms!).
You'd love Japanese power after that!!... ;-)
Happy frequency surfing!
Dom.