Hi-UD Glass
＜
Graph 1
＞
0
10
20
30
40
50
60
70
80
90
100
0.02
0.01
0
0.01
0.02
NTSC 400TVL(30lp/mm)
F1.6
HDTV 600TVL(55lp/mm)
Defocus(mm)
MTF(%)
Canon’s New HDgc Series
KH20x6.4 KRS
Canon’s Philosophy:
Canon has always developed new technology with four basic philosophies, "High Quality of Picture", "Ease of Operation",
"High Specification" and "Minimize Environmental Impact". Canon's HDTV lenses are, so to speak, a compilation of our
basic philosophies. Now, Canon adds a new concept to the HDTV lenses by launching the new HDgc Series.
Shuttle Shot Function
Shuttle Shot is a Canon Exclusive Technology that enhances production capabilities. At the touch of a button, this feature allows the
operator to zoom back and forth instantly between any two positions. It can be used to zoom to the telephoto position to check focus and
then return instantly to the original position or you can “shuttle” between any two zoom positions at any time.
Compact Design
The KH20x is smaller in size and lighter in weight compared to the traditional BCTV lenses, which allows ease of use when carried on a
shoulder.
Advanced Drive Unit
The new ergonomically designed drive unit achieves an ideal balance and comfort by having it tilt to an ideal angle. In addition, the size of
the unit has been minimized to comfortably fit in the palm of one’s hand. Overall, it improves the feeling of unity between the user and the
lens. Moreover, the drive unit is equipped with a Shuttle Shot Function while offering a maximum zoom speed of 1.2sec from wide end to
tele end.
Other Features of KH20x6.4 KRS
Concept of HDgc Series
Corresponding to the popularity of digital High Definition broadcasting and diversity of HDTV
equipment, Canon has added a new series to its HDTV lens line up, the HDgc series. The new HDgc
series supports the emergence of an important new generation of cost-effective HD acquisition systems.
Adopting the advantages created by Canon’s unique technology, the new HDgc lenses exhibit high
MTF, high resolution and high contrast from the center of the image to its extreme edges, meanwhile
maintaining its compact size and weight.
Another important policy of Canon’s is not to pollute the earth and the HDgc series succeeded in
excluding harmful substances such as cadmium, PBBS, PBDPE or mercury from the mechanical parts,
and at the same time incorporating lead free glass and reducing the amount of hazardous substances
used in electrical parts.
Meet Canon’s new HDgc series lenses, a compilation of Canon’s advanced technologies.
Optical Performance of HDgc Series
Aberration Correction for HDgc Lenses
In the HDTV system the pixel size is about half. Therefore, the spread of a point image caused by a
spherical aberration, coma etc. should be diminished to about half. The MTF varies as the focus
changes and even if the image is slightly out of focus, the MTF is greatly influenced as shown in
Graph 1. HDgc greatly contributes to correcting and minimizing these aberrations at the same time
maintaining high MTF throughout the edge of the picture.
Special Optical Elements
With the goal of minimizing chromatic aberration, the HDgc series lenses utilizes special elements
including an artificially re-crystalized element, “Fluorite”, with extraordinary dispersion characteristics
and the newly developed “Hi-UD” (high index ultra low dispersion) glass. Canon has succeeded in the
practical use of special elements along with advanced design techniques like “separate achromatism”.
KH20x6.4 KRS (Unit:mm)
DIMENSIONS
ZOOM LEVEL
(TELE POSITION)
F. B. ADJUSTING
LOCK SCREW
45
°
30
°
117.6
163.3
57.3
45.7
103
DIP SWITCH
VTR SWITCH
SHUTTLE-SHOT SWITCH
INDEX MARK
∞
m
2.5
12
ft
20
47
1.7
1.3
1.0
50
30
128
60
6.4
15
2
2.8
4
5.6
8
11
16
C
(In AIR)
4.5
6
8
1.4
HOOD
ZOOM OPERATION
CHANGE-OVER KNOB
MACRO BOTTON
CONNECTOR
FOR REMOTE ZOOM CONTROL
39.5
82P0.75
φ
85
φ
91.4
F.B=38
±
0.03
182.5
2
±
0.02
4
2.5
±
0.2
φ
48
0.025
0.050
SPECIFICATIONS
20X
6.4 – 128mm
1:1.4
at 6.4 – 89.6mm
1:2.0
at 128mm
89.8 x 50.5cm
at 6.4mm
4.6 x 2.6cm
at 128mm
57.1
°
x 34.1
°
3.1
°
x 1.8
°
0.9m (10mm with Macro)
W x H x L = 163.3 x 103 x 182.5 mm
1.27Kg
16:9
KH20x6.4 KRS
Zoom Ratio
Range of Focal Length
Maximum Relative Aperture
Angular Field of View
Minimum object Distance (M.O.D.)
Object Demensions at M.O.D.
Approx. Size
Approx. Mass
• Reduced Chromatic Aberrations
• High and Flat MTF
• Countermeasures Against Ghosting and Flares
High Water / Dust Resistant Design
Short M.O.D.
0.9m
New HDgc Logo
HDTV Optical Performance
Compact Design
Only 182.5mm / 1.27kg
Enhanced Macro Function
Allows from the lens front an
M.O.D. of 10mm.
Ecological Design
Shuttle Shot Switch
DIP Switch
New Ergonomic Drive Unit
The new ergonomically designed drive unit achieves an
ideal balance and comfort by having it tilt to an angle.
In addition, the size of the unit has been minimized to
comfortably fit in the palm of one’s hand. Overall, it
improves the feeling of unity between the user and the
lens.
Grip Support
Allows a user to
securely grip the drive
unit without pressing on
the VTR or Shuttle Shot
buttons.
Ribbed Surface
The ribbed surface on
the bottom of the drive
unit provides better
handling control.
Maximum Zoom Speed 1.2sec.
from wide end to tele end.
Ecological Design
The HDgc series has succeeded in reducing the use of
harmful and hazardous substances that could pollute the
environment.
