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

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In-focus
Forward focus
Rear focus
Sensor Output
Image
Plane
Line
Sensor
Field
Lens
Secondary
Imaging Lens
Correct spacing between
double images
Narrow spacing between
double images
Wide spacing between
double images
Sensor A Sensor B
d
TTL-SECONDARY IMAGE REGISTRATION PHASE-DETECTION SYSTEM
The light transmitting through a pair of 
the secondary imaging lenses focuses 
on separate sensors. The sensor output 
diagram illustrates this state of focusing. 
The TTL-Secondary Image Registration 
Phase-Detection System determines the 
positional relationship between the two 
images (Refer to “d” in figure) to detect 
the amount and direction of defocusing.
AUTO FOCUS TECHNOLOGY
To meet the increasing demand in broadcast HDTV production for 
highly accurate focusing, Canon introduced a revolutionary HDTV 
Auto Focus System. This pioneering technology automatically 
keeps images in focus, allowing professional camera operators to 
concentrate on capturing action and beauty shots.
Canon’s advanced Auto Focusing for DIGISUPER HDTV Zoom Lenses 
employs the TTL-Secondary Image Registration Phase-Detection 
System originally developed for single-lens reflex still cameras, 
to deliver both high accuracy and a high tracking capability for 
broadcast HDTV.
This article refers to Auto Focus Technology for DIGISUPER HDTV Zoom Lenses employed  
in the listed lenses. The specifications of the listed lenses are shown on pages 17-21.
CUSTOMER SATISFACTION
Canon is committed to total customer satisfaction. In order to optimize customer satisfaction, Canon’s aim is to support 
users by developing new lens technologies, high-quality technical service systems, and other sales support.
DIGISUPER 86
AF
DIGISUPER 100
AF
DIGISUPER 27
AF
MODE
FULL TIME AF
PART TIME AF
How AF Works
Usually activated.
Focus position is locked  
while the SW is pushed.
Usually off.
Activated while the SW is pushed.
Recommended
Application
Sporting event, etc.
To follow a moving object.
Studio production, etc.
To confirm the best focus position.
CANON’S WORLDWIDE SUPPORT NETWORK
Well trained sales people and service technicians are ready to support you at these locations.
AF OPERATION MODES WITH ACTIVE / HOLD SWITCH
FEATURES
  Extremely high focusing accuracy  
in full HDTV specifications.
  Ability to focus from a completely 
de-focused status without hunting.
  Ability to focus on a high speed 
moving object.
  Size and position of the  
AF frame (target area) in the  
camera VF can be changed from  
the Focus Demand FDJ-P31/P41  
(the size of the AF Frame can be 
changed in 3 steps). Please  
confirm the AF camera-lens  
interface with your camera 
manufacturer of choice.
  The AF system’s two operation  
modes can be the answer to a  
professional camera operator’s 
various demands.
Focusing Group
Variator
Front Relay
Compensator
Pupil
Internal Extender/
Back Relay
CCD
Beam
Splitting
Prism
AF Canon
Original
Sensor
Prism
ELEMENT LAYOUT
CHANGEABLE FRAMES
C
ANON’
S EPOCH-MAKING 
TECHNOL
OG
Y
7
6
C
ANON’
S EPOCH-MAKING 
TECHNOL
OG
Y