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safe shutter speed / shutter angle combos


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#1 Chris Stones

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Posted 01 July 2008 - 06:51 PM

I'm trying to find a formula to work out safe shutter speed / shutter angle combinations shooting on 60hz.

Anybody know how I can work this out please?

Thanks
chris
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#2 Adrian Sierkowski

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Posted 01 July 2008 - 07:14 PM

All of this can be found in the ASC manual as well as using certain programs on palm such as pCine. I even (at home) have a little card listing them all.
See also

http://www.rickwisedp.com/flicker.htm

some creative googling can get you other answers

http://www.lemac.com...TS/FLICKER.html (50hz list)
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#3 Saul Rodgar

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Posted 01 July 2008 - 07:38 PM

I'm trying to find a formula to work out safe shutter speed / shutter angle combinations shooting on 60hz.

Anybody know how I can work this out please?

Thanks
chris


Square wave HMI's (in flicker free mode) are safe at any shutter speed at 60 hz.

Quoting David Mullen:

"With square-wave electronic ballast in flicker-free mode, you have so many more pulses that a 45 degree shutter angle should not be a problem, nor with Kinoflos, which have a high flicker rate. But with ordinary household flourescents in the location, you may have exposure problems."

http://www.2-popforu...ead.php?t=86882
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#4 Duran Levinson

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Posted 02 March 2010 - 03:56 PM

I'm trying to find a formula to work out safe shutter speed / shutter angle combinations shooting on 60hz.

Anybody know how I can work this out please?

Thanks
chris


Interesting. I checked out that manual and i live in SA, so we use 50Hz. I have my first "semi-decent" graduation film coming up and i want to shoot with a Bolex H16 for some interior shots. Can you change to any shutter angle and still not get flicker from Kino's and HMI's? And what about shooting high speed on S16, if i want to go over 100fps?
And any suggestions about shutter angles.

Cheers
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Visual Products

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Broadcast Solutions Inc

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FJS International, LLC

Paralinx LLC

Media Blackout - Custom Cables and AKS