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August 29th, 2006, 02:47 PM
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#1 |
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Regular Crew
Join Date: Jul 2004
Location: NY
Posts: 57
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what is the formula for counter balancing the jibs?
Jony Jib here, what is the weight of camera to counter weight ratio?
I could have sworn it was 2.5:1 weight to camera. any thoughts? |
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August 29th, 2006, 03:02 PM
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#2 | |
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Major Player
Join Date: May 2005
Location: Europe
Posts: 844
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Quote:
ratio of : distance from pivot-point to camera divided by distance from pivot-point to counter-weight. (assuming minimal friction at pivot-point etc, and pivot-point is nominally at CofG of the whole rig etc etc) |
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August 29th, 2006, 03:08 PM
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#3 |
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Regular Crew
Join Date: Jul 2004
Location: NY
Posts: 57
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ok, so lets say I have a 10lb camera and the pivot point is 12 feet away from the camera and the weight is 4 feet from the pivot point.
would that mean 12/4 = 3 x 2.5(10lbs) or 3 x 2.5 x 10 ? thats 75lbs either way. so I'd need that much? |
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August 29th, 2006, 04:04 PM
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#4 | |
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Major Player
Join Date: Aug 2003
Location: Los Angeles, CA
Posts: 350
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Quote:
The equation is: (Distance Camera-to-Pivot) -------------------------------- X (Camera Weight) = Counterweight (Distance Pivot-to-Counterweight) So in your case: (12 feet / 4 feet) x 10 lbs = 30 lbs Keep in mind this equation just gives you a ballpark number and does not take into account the weight of the jib arms. The actual weight will be a little more. |
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