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Arri 35 III , shutter angle conversion


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#1 Patrick Tong

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Posted 16 April 2009 - 02:10 AM

Hello, I have a Arri 35 III with fixed 180-degree shutter, does anybody know who does shutter angle conversion from 180 to 172.8 ?

thanks,
Pat :rolleyes:
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#2 Olex Kalynychenko

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Posted 16 April 2009 - 03:39 AM

Hello, I have a Arri 35 III with fixed 180-degree shutter, does anybody know who does shutter angle conversion from 180 to 172.8 ?

thanks,
Pat :rolleyes:


You need synchronize of HMI lighters with magnetic ballast and 50HZ power at 24 fps shooting ?
May be you need use speed 25 fps ?
25 fps and 50Hz synchronize at any shutter angle.
Or ,to use HMI lighters with electronic ballast.
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#3 Patrick Tong

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Posted 16 April 2009 - 04:20 AM

Hi Olex Kalynychenko

<50HZ power at 24 fps shooting ?>
yes. :rolleyes:




You need synchronize of HMI lighters with magnetic ballast and 50HZ power at 24 fps shooting ?
May be you need use speed 25 fps ?
25 fps and 50Hz synchronize at any shutter angle.
Or ,to use HMI lighters with electronic ballast.


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#4 Olex Kalynychenko

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Posted 16 April 2009 - 07:25 AM

Hi Olex Kalynychenko

<50HZ power at 24 fps shooting ?>
yes. :rolleyes:



You correct,
if you need shoot of 24 fps with 50 Hz HMI lighters with magnetic ballast, you must think about synchronization, because, the correct synchronization will have cine camera with shutter angle of 172.8.
You have camera with 180 degree of shutter disk.

About Arri 35III camera need check of claw mechanism , mission profile of claw mechanism.

But, you can think about use of speed shooting 25 fps.
The speed 25 fps and 50 Hz HMI lighters synchronously for all angle of shutter disk.
The other speeds, what have full synchronization between 50 HZ and any angle of shutter disk :
16.6666, 20.0, 33.333, 50 fps.

Other way - to use modern HMI lighters with electronic ballas , with high frequency conversion.
or, to use of motor-generator set with adjustable frequency of output voltage.
You need voltage with 48 Hz.
Or, to need use of daylight or Tungsten lighters.

We have 50 HZ main power at Ukraine too and shoot of many footages with speed of 25 fps.

Edited by Olex Kalynychenko, 16 April 2009 - 07:25 AM.

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