Kenyon Gyros and Still Lenses
If you have a large enough tripod
and head or even a unipod on solid ground, you can shoot with any focal length
lens. But if you are in a vehicle or boat, a tripod won't help much. Most important
is supporting or holding the camera and gyro combination at the center of gravity
or in line with the CG of the combined two.
Here is a Canon 800mm with a Kenyon
KS-8 attached. The gyro is 1/2 the weight of the camera and lens as recommended
by Kenyon. Putting the gyro on the bottom conveniently lowers the CG of the
lens and gyro to just under the barrel of the lens. The rubber tubing isn't
exactly gimbaled at the CG but very close and it's simple. A stop so the tubing
couldn't slip backward would be wise; a block of wood and a hose clamp will
do. Don't hold the tubing together above the lens. The tubing should be supported
from two points to the sides of the lens to lower and limit the contact of the
tubing closer to the bottom of the lens barrel at the CG.
Here is a 500mm mirror that is light
enough to handhold and a KS-4 which is powerful enough to stabilize it. I added
a shelf bracket to place the left hand lower and forward symmetrical to where
the right hand holds the camera. This is symmetrically in line with the CG of
the camera, lens and the right hand. The regular Kenyon mounting hardware does
not allow thread space to add a bracket here. See Kenyon
Mounting Issues. I use my left hand fore finger to focus the lens.
For a 50-300mm zoom, a cradle is
needed to support it at its CG and to attach the gyro. This lens and gyro combination
is heavy enough to need a support from above or below.
Still cameras can be supported from
below if there is enough flex to allow the gyro to "work" and counteract
the movement of the support. Shock mounts will work and should be at or symmetrical
to the CG of the lens and gyro. If you are working both on and off a tripod,
a quick release is handy. Your isolation mount can be added when you need to
use the gyro. A special carrying bag for the gyro is wise. The gyro and isolation
mount could have the quick release attached, to switch from one to the other
© Copyright 1999-2004 Ron Dexter.
All Rights Reserved.