Canon CN-E85mm T1.3 L F Brochure (en)

Download
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.
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.
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.
 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).
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. 
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.
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.
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.
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.
UHD ZOOM LENS
DESIGNED TO SUPPORT 4K UHD BROADCAST SYSTEMS AND DELIVER 
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. 
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.
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.
 
C
ANON’
S EPOCH-MAKING 
TECHNOL
OG
Y
13
12
C
ANON’
S EPOCH-MAKING 
TECHNOL
OG
Y