flicker, big space, many light sources
Posted 02 February 2009 - 04:33 PM
Thanks and best,
Posted 02 February 2009 - 04:38 PM
Posted 02 February 2009 - 05:02 PM
Shooting on an ST and an LT, so both cameras are crystal sync.
I was out shooting tests of street lamps tonight and building sites and tracts of desert lit with sodium vapour lamps, will view the results tomorrow.
Thank goodness for Master Primes, Kodak 5219 and a Nikon D3.
Posted 02 February 2009 - 05:14 PM
David is correct though, at a 1/50th everything at 50hz should be fine.
Posted 02 February 2009 - 06:07 PM
There are many light sources in the place, ranging from LED's to fluorescents to metal halides -
My concern would be the LED's. If they're in displays -- arrival/departure, advertising, etc. -- they may be running at their own refresh rate, not the power frequency. Flourescents in the old days ran at the mains frequency, more modern ones run at much higher frequencies, and are unlikely to be a flicker problem. In some places, I doubt Dubai is one of them, the mains frequency isn't all that accurate, either.
Given 50 Hz power and 24 fps, 172.8 degrees is the right answer. Bear in mind that your viewfinder doesn't show you the same shutter angle you're shooting with, so flicker in the finder isn't a clue as to what you'll get on film. On the old Eclairs, you could take the lens and magazine off, and run the motor while you looked straight through the aperture. That would show you exactly what kind of flicker or roll bar effects you'd get. With the Arricams, unfortunately, that wouldn't be practical.