Canon CN-E85mm T1.3 L F Brochure (en)
OVERALL COMPARISON: SDTV VS HDTV
Whereas one frame of the conventional SDTV (ie: NTSC) system
consists of 480 scanning lines, the number of scanning lines is
more than 1.5 times that for the HDTV system. Furthermore, the
density of the scanning lines are even higher because the HDTV
system has an aspect ratio of 16:9, which is wider and shorter in
height than that of the normal SDTV (4:3 aspect ratio) system.
The spatial frequency required for the HDTV system is about
twice that required for the NTSC system.
consists of 480 scanning lines, the number of scanning lines is
more than 1.5 times that for the HDTV system. Furthermore, the
density of the scanning lines are even higher because the HDTV
system has an aspect ratio of 16:9, which is wider and shorter in
height than that of the normal SDTV (4:3 aspect ratio) system.
The spatial frequency required for the HDTV system is about
twice that required for the NTSC system.
Overall, the resolution of the HDTV system is about twice
that of the NTSC system and therefore, the lens requires
much higher performance than the conventional lenses.
that of the NTSC system and therefore, the lens requires
much higher performance than the conventional lenses.
2/3”
HDTV
NTSC
Image Format
9.6 x 5.4
8.8 x 6.6
Nominal Frequency
600 TVL
400 TVL
Spatial Frequency
55 Line pairs /mm
30 Line pairs /mm
HDTV DEPTH OF FIELD
As the HDTV system has high resolution, even a small
out-of-focus area can be detected. Since the radius of
the permissible circle of confusion is about half that of
the conventional system, the depth of field becomes
proportionately smaller. Therefore, the focusing has to
be done with great care.
out-of-focus area can be detected. Since the radius of
the permissible circle of confusion is about half that of
the conventional system, the depth of field becomes
proportionately smaller. Therefore, the focusing has to
be done with great care.
HDTV SENSITIVITY
Two factors have to be considered
to compare the sensitivity of the
HDTV system with that of the
conventional system. The first
factor is that the HD camera has an
aspect ratio of 16:9. This makes the
sensitive area smaller and causes
a 10% difference in sensitivity.
The second factor is related to the
HDTV system’s depth of field, which is half of the conventional
system. Therefore, on HD cameras, the lenses must be stopped
down until their F-number becomes double in order to get the
same depth of field as that in the conventional system. This
reduces the sensitivity to one fourth (1/4).
to compare the sensitivity of the
HDTV system with that of the
conventional system. The first
factor is that the HD camera has an
aspect ratio of 16:9. This makes the
sensitive area smaller and causes
a 10% difference in sensitivity.
The second factor is related to the
HDTV system’s depth of field, which is half of the conventional
system. Therefore, on HD cameras, the lenses must be stopped
down until their F-number becomes double in order to get the
same depth of field as that in the conventional system. This
reduces the sensitivity to one fourth (1/4).
HDTV ABERRATION CORRECTION
The pixel size is about half in the
HDTV system, and therefore the
spread of a point image caused by
a spherical aberration should be
diminished to about half. Even if
the image is slightly out of focus,
MTF is greatly influenced.
HDTV system, and therefore the
spread of a point image caused by
a spherical aberration should be
diminished to about half. Even if
the image is slightly out of focus,
MTF is greatly influenced.
The graph shows how MTF varies
when the focus changes. Canon HDxs Series lenses employ the
HD version of the Power Optical System, which incorporates
the X-Element. HDxs greatly contributes to help correct and
minimize these aberrations in a compact lightweight lens body.
when the focus changes. Canon HDxs Series lenses employ the
HD version of the Power Optical System, which incorporates
the X-Element. HDxs greatly contributes to help correct and
minimize these aberrations in a compact lightweight lens body.
HDTV
16:9
NTSC/PAL
4:3
6.6
5.4
8.8
9.6
ø11
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)
GRAPH 1
MTF(%)
THE HDTV LENS SERIES
Canon began developing lenses for the “HDTV System” more than 20 years ago. Canon was the first manufacturer to complete a
standard series consisting of five basic models of practical 2/3” HDTV lenses by launching the HJ15x8B in 1997 in addition to four
existing lenses: Standard, Tele, and Wide portable, as well as Studio / Field. Canon continues to lead the broadcast industry into
the 21st century “DTV” era with the next generation of lens families, consisting of the following four HDTV Lens Series.
standard series consisting of five basic models of practical 2/3” HDTV lenses by launching the HJ15x8B in 1997 in addition to four
existing lenses: Standard, Tele, and Wide portable, as well as Studio / Field. Canon continues to lead the broadcast industry into
the 21st century “DTV” era with the next generation of lens families, consisting of the following four HDTV Lens Series.
HDxs Series
Shown on pages 17-21 and 27.
STUDIO/FIELD LENSES
COMPACT STUDIO LENS
EFP LENSES
Portable HDxs Series
Shown on pages 26-30.
ENG/EFP Lenses
Built-in
Optical Image Stabilizer Lens
HDgc Series
Shown on pages 31-34.
ENG Lenses for 2/3” Cameras
ENG Lenses for 1/2” Cameras
ENG Lenses for 1/3” Cameras
4K UHD TECHNOLOGY
NEW BCTV LENSES DESIGNED TO ACCELERATE THE PACE OF 4K UHD CONTENT CREATION
As 4K continues its steady integration into mainstream television dramas, documentaries, and movies, Canon has worked to be at
the technological forefront with its innovative Cinema EOS series and development of 4K Optics. The needs of broadcast television
producers to achieve the high image quality of 4K UHD and more powerful ways of expression are now spreading to live telecasts of
sports, concerts, and events. The imperative need for 4K lenses that can offer the long focal ranges that are central to contemporary
sports coverage while maintaining the usability and ease of operation that the broadcast industry favors, is increasing at a rapid
pace. In response to these new marketplace needs, Canon is offering lenses whose performance neatly dovetails with the various
new 2/3,” small-format 4K UHD cameras as part of its onward drive to support this new movement. By offering lenses that fit in with
the applications and objectives of users, Canon is taking steps to actively open up new dimensions of potential in video performance.
4K images can convey such a sense of presence and an almost 3-dimensional feeling that viewers sense they are actually involved in
the action; through such images, these lenses can impart new values to user content and allow viewers to experience videos in new and
fresh ways.
the technological forefront with its innovative Cinema EOS series and development of 4K Optics. The needs of broadcast television
producers to achieve the high image quality of 4K UHD and more powerful ways of expression are now spreading to live telecasts of
sports, concerts, and events. The imperative need for 4K lenses that can offer the long focal ranges that are central to contemporary
sports coverage while maintaining the usability and ease of operation that the broadcast industry favors, is increasing at a rapid
pace. In response to these new marketplace needs, Canon is offering lenses whose performance neatly dovetails with the various
new 2/3,” small-format 4K UHD cameras as part of its onward drive to support this new movement. By offering lenses that fit in with
the applications and objectives of users, Canon is taking steps to actively open up new dimensions of potential in video performance.
4K images can convey such a sense of presence and an almost 3-dimensional feeling that viewers sense they are actually involved in
the action; through such images, these lenses can impart new values to user content and allow viewers to experience videos in new and
fresh ways.
CANON’S TECHNOLOGIES THAT ACHIEVE 4K
Each 2/3,” small-format 4K pixel is equivalent to approximately 2.5
μm, which is one-half of the size of the 2/3” HD pixels.
These are approximately 1/2.7 smaller than the pixel size of the 4K Super 35mm image sensor. This means that, for these
lenses, it is extremely important to establish the high-grade design and production technologies that will help ensure the
requisite 4K UHD image sharpness while minimizing optical aberrations. Described below are the latest technologies Canon
has developed and is utilizing to achieve these goals.
lenses, it is extremely important to establish the high-grade design and production technologies that will help ensure the
requisite 4K UHD image sharpness while minimizing optical aberrations. Described below are the latest technologies Canon
has developed and is utilizing to achieve these goals.
UHD ZOOM LENS
DESIGNED TO SUPPORT 4K UHD BROADCAST SYSTEMS AND DELIVER
SUPERB OPTICAL PERFORMANCE
SUPERB OPTICAL PERFORMANCE
WHAT ARE CANON’S UHD LENSES?
The optical designs of Canon’s HD lenses do full justice to UHD imagery, having four
times the spatial resolution of a standard HDTV ststem. The associated stunning image
sharpness is created by the combination of the remarkable contrast that Canon’s
multilayer optical coatings provide, and superb resolution from the central picture
region out to the image extremities.
times the spatial resolution of a standard HDTV ststem. The associated stunning image
sharpness is created by the combination of the remarkable contrast that Canon’s
multilayer optical coatings provide, and superb resolution from the central picture
region out to the image extremities.
Canon’s UHD Series lenses are the most high performance lenses among
Canon’s BCTV lenses. Canon’s proprietary optical coatings help facilitate the vibrant
color reproduction expected from the UHD wide color gamut specifications, while
simultaneously providing excellent tonal reproduction. A variety of proprietary design
techniques helps ensure preservation of these performance levels across the entire
focal range of these remarkable zoom lenses.
Canon’s BCTV lenses. Canon’s proprietary optical coatings help facilitate the vibrant
color reproduction expected from the UHD wide color gamut specifications, while
simultaneously providing excellent tonal reproduction. A variety of proprietary design
techniques helps ensure preservation of these performance levels across the entire
focal range of these remarkable zoom lenses.
WHAT IS “4K PREMIUM”?
“4K Premium” refers to the flagship line of Canon’s UHD series lenses that
exceed standard 4K optical quality expectations. Specifically, the central image
sharpness is extremely high and traditional optical aberrations are virtually
invisible. The very high contrast ratio helps produce deep rich black levels and
superb reproduction of scene detail in shadowed areas. This lens is ideal when
used in an HDR (high dynamic range) and WCG (wide color gamut) 4K UHD image
acquisition system.
exceed standard 4K optical quality expectations. Specifically, the central image
sharpness is extremely high and traditional optical aberrations are virtually
invisible. The very high contrast ratio helps produce deep rich black levels and
superb reproduction of scene detail in shadowed areas. This lens is ideal when
used in an HDR (high dynamic range) and WCG (wide color gamut) 4K UHD image
acquisition system.
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