Canon EOS C300 Mark II CINEMA RAW DEVELOPMENT INSTRUCTION MANUAL Version 1.4 M - Page 11

Dual Pixel CMOS Auto Focus - dual pixel af

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3.4 Dual Pixel CMOS Auto Focus The Focus Guide system just described is specifically intended to totally support the longestablished craftsmanship of the cinematographer whose manual control of focusing actions is an essential part of the creativity embodied in so many scenes. It is anticipated that the excellent imaging and recording capabilities of the C300 Mark II will see this camera used on many forms of high-end productions in moviemaking and in television. Separately, the C300 Mark II is expected to also continue the legacy set by the original C300 within that quite separate production world of documentaries, news magazine productions, and a range of television run 'n gun program genres. In many of these productions achieving and sustaining accurate focus can pose inordinate challenges. An automatic focusing system - that can be fully relied upon - can make all the difference in achieving footage of exceptional quality. For this reason the C300 Mark II also embodies a Dual Pixel CMOS Auto Focus (AF) system that was first introduced more than a year ago in the C100. However, unlike that initial system which constrained a fixed cursor position in the image center, the new system allows that cursor to range across most (80% horizontal and vertical) of the image area. This supports incredibly smooth and consistent automatic rack focusing between selected subjects within the scene while also ensuring precision focus tracking if those subjects move within the scene. Figure 14 Simplified depiction of the Dual Pixel CMOS AF control loop operating with EF lenses. Face Detection is allied with this AF function Dual Pixel CMOS AF is compatible with over 103 Canon EF lenses, and with these lenses Face Detection AF also becomes possible - see Figure 15. This feature, when enabled, allows for incredibly responsive and reliable contrast detection auto-focusing. Face AF is capable of tracking more than one face at a time, allowing the shooter to switch from one face in frame to another. Based upon the experiences of those using Dual Pixel CMOS AF in the C100 Mark II there emerged diverse commentaries on the speed of the closed loop lens drive. Recognizing that this can vary for different shooting conditions a menu has been added into the C300 Mark II that allows selection of ten different speeds - a function that is applicable to those lenses having the capability of low-speed drives. 10

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3.4
Dual Pixel CMOS Auto Focus
The Focus Guide system just described is specifically intended to totally support the long-
established craftsmanship of the cinematographer whose manual control of focusing actions is
an essential part of the creativity embodied in so many scenes.
It is anticipated that the
excellent imaging and recording capabilities of the C300 Mark II will see this camera used on
many forms of high-end productions in moviemaking and in television.
Separately, the C300 Mark II is expected to also continue the legacy set by the original C300
within that quite separate production world of documentaries, news magazine productions, and
a range of television run ‘n gun program genres.
In many of these productions achieving and
sustaining accurate focus can pose inordinate challenges.
An
automatic
focusing system – that
can be fully relied upon – can make all the difference in achieving footage of exceptional quality.
For this reason the C300 Mark II also embodies a
Dual Pixel CMOS Auto Focus (AF)
system
that was first introduced more than a year ago in the C100.
However, unlike that initial system
which constrained a fixed cursor position in the image center, the new system allows that cursor
to range across most (80% horizontal and vertical) of the image area.
This supports incredibly
smooth and consistent automatic rack focusing between selected subjects within the scene
while also ensuring precision focus tracking if those subjects move within the scene.
Figure 14
Simplified depiction of the Dual Pixel CMOS AF control loop operating with EF lenses.
Face
Detection is allied with this AF function
Dual Pixel CMOS AF is compatible with over 103 Canon EF lenses, and with these lenses Face
Detection AF also becomes possible – see Figure 15.
This feature, when enabled, allows for
incredibly responsive and reliable contrast detection auto-focusing. Face AF is capable of
tracking more than one face at a time, allowing the shooter to switch from one face in frame to
another.
Based upon the experiences of those using Dual Pixel CMOS AF in the C100 Mark II there
emerged diverse commentaries on the speed of the closed loop lens drive.
Recognizing that
this can vary for different shooting conditions a menu has been added into the C300 Mark II that
allows selection of ten different speeds – a function that is applicable to those lenses having the
capability of low-speed drives.
10