Canon DIGISUPER 86AF BROCHURE

The Established Field Lens featuring Powerful

HDTV Auto Focus technology and Superior

Image Stabilizer

Recently there has been a greater demand for broadcast HDTV production and the requirement for
accuracy in focusing has risen in response to this demand. Canon has been and continues to be a pioneer
in the design of broadcast lens and meets this demand with the introduction of a revolutionary HDTV
Auto Focus System. For many years the market has been requesting this unique technology for HDTV
production and the Auto Focus System has now been adapted into several of Canon’s DIGISUPER HDTV
zoom lenses. Canon has implemented Auto Focusing into the DIGISUPER 86 xs which is already known
for its optical performance and ease of operation due to its optical image stabilizer. This technology
assists professional camera operators in concentrating on the action/ beauty shots while maintaining the
images in focus. Canon’s advanced Auto Focusing for the DIGISUPER HDTV Zoom Lens employs the
TTL-Secondary Image Registration Phase-detection system, originally developed for single-lens reflex
still cameras, in order to pursue both high accuracy and a high tracking capability for broadcast HDTV.

Prominent features of DIGISUPER 86AF

Canon’s unique “Power Optical System” and “X-Element” with a 86:1(9.3-800mm) focal length range has made it possible
to maintain high optical quality while dramatically reducing chromatic aberration. Its superior optical capacity allows the
lens to offer a maximum relative aperture of 1.7 and a minimum object distance of 3.0 meters.

Power Optical System and X-Element

• Breakthrough Power Optical System design

- achieves higher specifications and quality

• The X-Element virtually eliminates aberrations

Internal Focusing System

(Advanced 3 group IF system)

• Achieves wide-angle with reduced distortion

• Minimal variation of chromatic aberration while

focusing

• Minimal variation of the center of gravity while

focusing

• Internal focusing system allows for Anti-Dust and

Anti-fog

Optical Shift Image Stabilizer (shift-IS)

• Due to extreme telephoto focal lengths Canon created a
superior optical image stabilization technology that prevents
the picture from shaking due to even the slightest wind or
operator movement

New Generation Digital Servo System

Servo System meets Robotic Requirements

• High resolution zoom and focus servo 13-bit repeatability

10-bit Iris Compatibility

• High resolution iris control

Wide Dynamic Range of Zoom and Focus Servo
Speed

• From ultra slow to high Max speed: Zoom 0.6sec, Focus

0.8sec

CAFS (Constant Angle Focusing System)

• 32-bit CPU calculates and controls the zoom when focusing to
counteract “breathing” (phenomena where picture size/ angle
of view changes when focusing) and has zero zoom effect

Outstanding features of Canon’s HDTV Auto Focus System

Canon’s Original Sensor Delivers High Focus Performance

• Focusing accuracy that meets full HDTV specifications (1920×1080 pixels)

• Ability to focus from a completely de-focused status without hunting

• Ability to focus on a high speed moving object

AF Operation Mode

The AF system’s two operation modes is the answer to a professional camera operator’s various demands.

【2 kinds of AF Operation Modes with ACTIVE/HOLD switch】

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.

AF Frame

The camera operator can focus on a specific object by controlling the position of the AF Frame (target area) in the
viewfinder from the Digital Focus Demand FDJ-P31/P41. The size of the AF frame (target area) can be changed
in 3 steps allowing for different subjects and compositions.

TTL-Secondary Image Registration Phase-detection System

The light transmitting through a pair of the secondary imaging lenses focuses on separate sensors. The following
figure 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.

Secondary Imaging Lens

Sensor Output

Sensor A Sensor B

Correct spacing between

double images

Narrow spacing between

double images

Wide spacing between

double images

d

Line Sensor

Image Plane

Field Lens

In-focus

Forward focus

Rear focus

Focusing Group

Front Relay

Pupil

Variator

Beam Splitting Prism

Internal Extender/

Back Relay

CCD

Compensator

Prism

AF

Canon

Original

Sensor

【Layout of the elements】

Structure of DIGISUPER HDTV Zoom Lens with Auto Focusing