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HJ15
e
x
8.5B KRSE
-
V
Main Features
New Solution for “Stable” HD Image Production
Preserving Full HDTV Optical Performance with incorporation of IS System
The nature of high definition imagery is the sensitivity to a sudden lowering of image
quality when the originating HD lens-camera system is subject to physical disturbances.
Based upon long term operational studies and extensive research Canon has successfully
developed a powerful real-time counter to the many forms of physical disturbances that can
be encountered on location shooting.
Powerful Image Stabilization for Various Environments
Throughout the entire zoom range, the Vari-angle Prism image stabilizer technology
provides real-time compensation for a wide range of disturbance frequencies to ensure
a high level of HD image stabilization. These disturbances include lens-camera jolting
associated with handheld and shoulder mounting by a camera operator who is in motion,
vibrations when tripod mounted on an unstable platform or in windblown environments,
to the higher vibration frequencies encountered when operating on vehicles, boats, and
aircraft.
Various Stabilizing Modes
In order to optimize the image stabilization action for different shooting conditions, various
stabilization modes are selectable. Combination of two modes from each category is
available and each mode is simply set by changing the switches on the lens.
Vari-Angle Prism Image Stabilizer (VAP-IS)
Under perfect shooting conditions, light rays from a scene pass through the lens optical
system in a tightly prescribed manner. Any vibration or jolt to the lens-camera system
will deflect those light rays and produce image unsteadiness. The VAP-IS technology is
incorporated within the lens optical system to intercept such light ray perturbations and
correct their deviations in real-time. The technology to do this is based upon a flexible
optical bellows that entails two flat glass elements separated by a special liquid forming a
sealed mini-optical grouping within the overall lens element groupings. The bellow expands
and contracts when the lens is physically disturbed – and the very high refractive index
of the liquid bends the disturbed light rays in the opposite direction. This imparts a high
degree of real-time correction to the angle of the light rays, ensuring they arrive at the
image plane devoid of any unsteadiness. There is considerable science underlying this
optomechanical subsystem and some years of incremental refinements to the design that
have produced the very high performance in the new HJ15ex8.5B lens.
Canon introduces an important innovation in HD production portable lens,
the HJ15ex8.5B KRSE-V. This is specifically intended to extend production
flexibilities in mobile HD shooting of many forms. The lens embodies a
built-in optical image stabilization system based upon Canon’s patented
Vari-Angle Prism Image Stabilizer (VAP-IS) technology. Canon’s IS
technology has been significantly improved over an earlier system deployed
a decade ago in a standard definition lens. Rock solid imagery is ensured
when the lens-camera system is subjected to a wide range of perturbation
frequencies encountered by a camera operator who is shooting handheld
while walking, running, or operating from a motorcycle pillion, within a
moving vehicle, boat, or helicopter.
Incident Ray
VAP-IS ON
Image Plane
Image
Shake
Without VAP-IS
Select According
to the
Shooting Situation
Portable mode
Compensates for motion-related disturbances while
shooting shoulder mount or handheld
Tripod mode
Effectively compensates for disturbances caused by
unsteady platform or wind.
Select According
to the Direction
of Disturbance
H+V mode
Optimizes stabilization action when disturbance frequencies
are both horizontal and vertical
V mode
Effectively counters vertical disturbances while operationally
panning the lens-camera
Light Ray