Canon HJ21ex7.5B Specifications - Page 2
Browse online or download pdf Specifications for Camera Lens Canon HJ21ex7.5B. Canon HJ21ex7.5B 2 pages.
Print Page
HJ21e
x
7.5B
The overall demand for HD production coupled with the growing diversity of production
applications has called for an expansion in the range of HD lenses. The HJ21ex7.5B
was specifically developed to support high-end HD production where minimization of
focus breathing (unwanted alteration to angle of view that accompanies manipulation
of the focus control), high imaging performance, extended focal range and a modestly
wide angle constitute core production requirements for drama and documentary program
origination. With the addition of the new digital drive unit the shooting versatility is further
enhanced. The 7.5mm wide angle setting and the 21x zoom ratio offer a formidable
operational combination for such high-end production work.
(New drive is loaded with the lens that has 'A' at the end of its model name such as
'IRSE A', 'IASE A'.)
Main Features
Specifically Designed for High-end HD Production
Focus breathing and variations in picture performance with refocusing at different
object distances have been traditional imaging challenges to high-end production
calling for high picture quality. By adopting the novel 3-group inner focus system
and setting a proper power for the front lens fixed group as well as the focus moving
group, the HJ21ex7.5B succeeded in minimizing such unwanted phenomena to an
exceedingly low level. Also the lens is designed to maintain high optical performance
across the entire 16:9 image plane, especially at the telephoto side of the focal length.
Within the standard BCTV lens lineups consisted of Wide, Standard and Telephoto
lenses, the addition of the HJ21ex7.5B establishes its own important category
supporting the special imaging requirements of the high-end HD production market.
High Imaging Performance with Special Optical Elements and
Exclusive Optical Layout
With the goal of minimizing various aberrations in order to meet the imaging
standards of high-end production, the HJ21ex7.5B adopts special optical elements
that include the artificially re-crystallized "Fluorite" featuring extraordinary dispersion
characteristics and the newly developed high index ultra low dispersion glass, "Hi-UD"
glass. These lens elements are scientifically exploited by the design of an optical
layout exclusive to this particular lens. The imaging achievement can be seen in its
high optical specifications and extraordinary performance. Featuring a broad focal
length range of 7.5mm to 158mm and a maximum relative aperture of F1.9, the lens
maintains its high optical performance throughout the entire zoom range.
Improved Operability & Reduced Operator Fatigue
Coupled with innovations in optical performance, is a totally new design of the digital drive unit.
Refined by long-term market research and worldwide experience, Canon mobilized the latest in 3D CAD-CAM design to significantly improve
the human tactile interface to the control of zoom, iris, and focus. Here are some results of Canon's research:
Reduced Physical Stress
Improved Ease of Operation
By reducing the width of the drive unit, the palm of
The spacing between the focus ring and drive unit
the camera operator's hand is positioned closer to
has been changed to avoid accidental interference
the optical axis, thus reducing the degree of arm
with the drive unit while manipulating the focus
bend which in turn lessens physical stress during
control.
prolonged shooting.
Exceptional High Optical Performance
High MTF, Minimized Chromatic Aberrations and
Countermeasures against Ghosting and Flares
Special Optical Elements
Ergonomic Design
a
b
c
The size and curvature size have been optimized to
more comfortably fit in the palm of the operator's
hand (a). Newly developed coatings improve the
tactile interface between the user and the drive unit
(b) together with the new Rubber Grip Support (c).
No Scene will Fail to Yield to the Imaging Prowess of Canon's HD Production Lens
Extremely small Focus Breathing
Enhanced Digital Drive Unit
Information
Display
Zoom Speed
Volume in New
Location
New Rubber
Grip Support
The incorporation of miniature 16-bit, high resolution
Rotary Encoder Devices into the new enhanced digital
drive unit, has extended the features of the HJ14x to
include:
• Precision control of all lens operations
• Precise digital repeatability of zoom, focus and iris
control that support innovative image creation
• Simple and direct digital integration into virtual studio
systems
• Precision zoom control over a total speed range of 0.5
sec. to more than 5 min.
Moreover, Canon's unique Information Display provides
easy, precise customization of the enhanced digital
functions.
Enhanced Digital Functions
Shuttle Shot
By memorizing any two focal lengths, the Digital Drive
Starting Point
can automatically "shuttle" between the two points,
moving in either direction.
Frame Preset
An angle of view can be preset in either of two memories
and the lens will zoom at the highest speed or in a preset
zoom speed to the preset position by pushing a simple
Starting Point
button.
Speed Preset
A specific zoom speed can be preset in memory and it is
possible to repeat the zoom speed as often as you like by
pushing a simple button.
Zooming in same speed
SPECIFICATIONS
HJ21ex7.5B
16:9
Built-in extender
1.0
Zoom Ratio
Range of Focal Length
7.5 158mm
15.0 316mm
Maximum Relative
1:1.9 at 7.5 116.0mm
1:3.8 at 15.0 232.0mm
Aperture
1:2.6 at 158mm
1:5.2 at 316mm
˚
˚
˚
65.2
39.6
at 7.5mm
35.5
Angular Field of View
˚
˚
˚
3.50
2.00
at 158mm
1.70
Minimum Object Distance (M.O.D)
120.4 67.7cm at 7.5mm
60.2 33.9cm at 15.0mm
Object Dimensions at M.O.D
5.60 3.20cm at 158mm
2.80 1.60cm at 316mm
Approx. Size
Approx. Mass (IRSE A / IASE A)
HJ21ex7.5B IRSE A
Zoom: Servo / Manual
Focus: Manual
HJ21ex7.5B IASE A
Zoom: Servo / Manual
Focus: Servo / Manual
Newly Designed Ergonomic
Drive Unit
Zoom Ratio 21x and Wide Angle of 7.5mm
Dynamic Zoom Speed Range
(0.5sec-5min from wide end to tele end)
Extremely High Optical Performance
High MTF, Minimized Chromatic Aberrations and Innovative Countermeasures
against Ghosting and Flares
Preset Position
Starting Point
Information Display
Frame 1
Frame 2
4:3
SWITCHABLE 4:3
2.0
1.0
1.2
21
6.2 130mm
7.5 158mm
1:1.9 at 6.2 116.0mm
1:1.9 at 7.5 116.0mm
1:3.8 at 15.6 232.0mm
1:2.15 at 130mm
1:2.6 at 158mm
1:5.2 at 316mm
˚
˚
˚
˚
˚
˚
20.4
at 15.0mm
60.8
47.5
at 6.2mm
51.3
39.6
at 7.5mm
27.0
˚
˚
˚
˚
˚
1.00
at 316mm
3.20
2.40
at 130mm
2.60
2.00
at 158mm
1.30
0.85m (10mm with Macro)
110.1 82.6cm at 6.2mm
89.3 67.0cm at 7.5mm
44.7 33.5cm at 15.0mm
5.10 3.80cm at 130mm
4.20 3.20cm at 158mm
2.10 1.60cm at 316mm
W H L=175.2 122.5 260.1mm
2.61Kg(5.76lbs) / 2.69Kg(5.94lbs)
2.0x Extender
2.4
15.0 316mm
˚
20.4
at 15.0mm
˚
˚
1.00
at 316mm