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Phantom gold

20 Kw tungsten reference

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#1 Matias Nicolas

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Posted 20 March 2013 - 06:03 PM

Hi ... i'm shooting my first comercial with Phantom Gold, cause the Flex is not avaliable . Which real sensibility is the gold at 25 fps ? Cause a friend told me that running at 300 fps the camera doesn't even reach 50 ASA .. 

And I never shot with a 20 Kw fresnell .. Do you know , aprox... , If I shoot at 600 fps, at which distance , should I put a 20k source without difussion? 


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#2 John Hadfield

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Posted 03 April 2013 - 05:02 AM

Hi Matias, Phantom HD Gold, we recommend you use 200ASA/ISO setting, but as always check your histagram on your HD monitor. Lighting you will be fine with 20k Tungsten, try not to use HMI. Hope that helps. We have been to Argentina on occasions, lovely crew. Best John Hadfield www.greendoorfilms.co.uk


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#3 David Mullen ASC

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Posted 03 April 2013 - 10:43 AM

Well, you lose 4-stops going from 25 fps to 400 fps, so that's an effective drop from 200 ISO to 12 ISO...


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#4 Stephen Price

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Posted 17 April 2013 - 03:08 AM

The true sensitivity of a correctly set up Phantom HD Gold shooting at 25/24fps 180 Degree Shutter is 160 ISO. This is rated to be accurate for cinematography use. 

 

Both large tungsten heads as well as any HMI can be used in most cases without flicker. When using any HMI lights, it is necessary to use 1000Hz HMI ballasts, most good lighting rental houses should have either 300Hz or 1000Hz ballasts. 

 

300fps is 3.5 Stops down from 24/25fps. This means the HD Gold will be at 15 ISO at 300fps and 7.5 ISO at 600fps. The distance of a 20K is really dependant on the subject and lighting conditions shooting in. The HD Gold has low latitude when compared to film or an Alexa, whites will clip quickly. Diffusing light sources and filling dark areas improves results.

 

Despite these draw backs, the Phantom HD Gold is still a very good high speed camera. As well as having numerous Phantom Flex's and other high speed cameras, we still have two Phantom HD Gold's which work regularly to this day. 

 

Stephen

Love High Speed

www.lovehighspeed.com


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