Zephyr ION Owner's Manual download pdf (Page 24)

Dynamic Balancing the Steadicam

Sled

A sled is in dynamic balance when the

center post remains vertical as the sled is

panned (and this is critical) at any and all

panning speeds.

Dynamic balance is extremely important

for precise operating and for whip pans.

For each arrangement of camera, monitor

position, post length, accessories, etc.,

there are many possibilities for statically

balancing the system.

However, for each arrangement of

camera, monitor position, post length,

accessories, etc., there is only one

combination that balances the sled both

statically and dynamically. There is some

leeway as to the required precision of

dynamic balance. What is acceptable

depends upon the operator and the

situation.

Dynamic balance can very easily and

quickly be achieved by the trial and

error method.

In all cases, when a sled is in dynamic

balance, both the camera’s c.g. and the

battery’s c.g. will be to the rear of the

centerline of the center post. This rule

gives you some point to begin balancing

the system.

Advanced Techniques

Dynamic Balance

Three gures to study for understanding dynamic balance

The top gure looks like the Model One or the SK sled. The camera c.g. is centered

over the post; the monitor and battery are on the same horizontal plane, and their

common c.g. is in the post. This unit is in dynamic balance and pans at.

The second gure has the monitor raised a bit. This looks like most sled

congurations, in either high or low mode. Note that the battery c.g. is closer to the

post, and the camera c.g. has moved to the rear. Why?? See the third gure.

In the third gure, the monitor has been raised all the way up in front of the camera.

It’s absurd, of course, but it makes a point. Now the common monitor and camera

c.g. is over the post, and the battery’s c.g. is directly under the post.

So you can see that as the monitor is raised, the camera c.g. must move to the rear

and the battery c.g. must move towards the post. With most sleds, the monitor c.g.

is raised above the battery c.g., therefore the camera c.g. is always to the rear of

the centerpost.

It typically works out that the camera c.g. is pretty close to .5in (12mm) to the rear

– a bit more if the camera is light or the monitor is higher, and somewhat less if the

camera is very heavy or the monitor is lower.

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Zephyr ION Owner's Manual Page 24

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