Canon Lens FD400mm Camera Operating instructions

  • Hello! I've analyzed the user manual for the Canon Lens FD400mm f/4.5 S.S.C.. This document provides details on the lens's rear group focusing system, its cam mechanism for focusing adjustments, and its compatibility with various filters. The manual emphasizes the lens's suitability for handheld shooting and its optical performance. I'm ready to answer your questions about the lens based on the content of this manual.
  • What is the focusing system used in this lens?
    What is the purpose of the cam mechanism in focusing?
    What are the available filters for this lens?
    Is it possible to do hand-held shooting with this lens?
    What is the focusing mechanism for a distance over 15 meters?
English
Edition
B*IIJ\&
Call
011
Canon
lens
FD400mm
f/4.5
S.S.C.
INSTRUCTIONS
fifflIDtaAlt
Canon
Lens
FD400mm
f/
4.5
S.S.C.
2
This lens
is
a super
telephoto
lens with a rear
group focusing system
that
Canon has just
developed.
As
far as optics are concerned,
this
400mm
lens has
the
fastest f/4.5 lens
speed
of
its kind
in
the
world and provides
superb image delineation. Moreover, it boasts
of
such features as light weight, compactness,
smooth focusing, and ease
of
operation.
These established characterises have resulted
in
a
400mm
lens which
is
suitable for hand-
held shooting
in
ordinary use. This lens
is
a
really new creation
brought
into
the
world
of
super
telephoto
lenses.
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FD400mm
F4.5
S.S.C
.
3
4
Main Characteristics
New Focus Adjusting Device: Rear
Group
Focusing System
The
focusing adjustment is,
in
general, per-
formed by drawing
out
the
whole lens con-
struction. However, this lens has
adopted
the
focusing system which relies
on
the
rear group
of
the
lens,
in
which
one
part
of
the
rear lens
group moves while
the
front
lens group and
another
part
of
the
rear lens group remain
fixed. This rear group focusing system allows
the
heavy, large apertu re,
front
lens group
to
be firmly fixed
to
the
mount,
and allows for
focusing by moving
one
part
of
the
light,
small aperture, rear lens group.
As
a result,
operation
of
this lens has been
further
im-
proved because
of
the
reduced size
of
the
lens
barrel and simplified mechanism.
As
the
over-
all
length
of
the
lens does
not
change and a
minimum subject distance
is
as
short
as 4m
close-up shorts
of
a face can be
obtained
which will entirely
fill
the
picture frame
if
the
camera
is
held vertically_ This lens was
carefully designed
to
compensate for aberra-
tion and for high performance.
Function Focusing Adjustment: Vari-pitch
Focusing Mechanism
In
the
conventional helicoid system,
as
the
protrusion
of
the
lens
is
determined according
to
the
rotation angle,
the
intervals between
the
distance scales become smaller when
focusing
is
required for distant subjects.
Another
drawback
of
the
helicoid
is
that,
since
the
depth
of
the
field
is
shallow, even
a slight error
of
the
focusing adjustment
leads
to
a blurred image. But,
the
FD400mm
uses a cam mechanism for
the
adjustment
of
the
lens. Hence,
the
adjustment
speed changes
according
to
the
curve
of
the
cam
in
order
to
allow enough space between
the
distance
scales
of
greater
than
15m_
This lens makes
finer focusing easier
as
it increases
the
graduation
in
the
focusing mechanism so
the
correct
focus can easily be identified and
the
possibility
of
distance adjustment errors
is
greatly reduced.
Hand-Held Shooting
With
the
adoption
of
this new system, opera-
tion
is
greatly improved and hand-held shoot-
ing has become possible, because
the
lens
is
lightweight and well balanced. Of course,
stabilized hand-held shooting
is
obtained
when using
the
tripod
mount
.
Excellent Optical Performance
Because
of
a well balanced design and pro-
perly adopted mechanism established through
the
use
of
the
fixed
part
of
the
rear lens
group, this lens has reduced secondary chro-
matic aberration
to
a minimum. It promises a
sharp picture image
in
every corner of
the
film.
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5
6
Specifications
Picture Size:
24
x
36mm
Lens
Construction
: 6 elements in 5 groups
Coating: Super Spectra
Coating
Angle
of
View
:
Horizontal
10'
Vertical
30
30'
Diagonal 60
10'
Focusing System: 2 elements in 1
group
in the rear
lens
group
move
by
means
of
a cam
Distance Scales:
ft
13
to
200
00
m 4
to
50
L.ens
Mount
:
FD
mount
(with
mount
lock),
5 kinds
of
mount
signals.
Aperture
:
FL
type
automatic
aperture, manual
lock
available.
Aperture
Scales:
4.5
to
22
and " A"
mark
EE
lock
available
Depth
-
of
-
Field
Scales and
Inf
rared
Index
Mark
:
Available
Filter
:
34mm
Drop
-in
filter
. Rear
part
plug-in
sys-
tem,
with
lock
.
REGULAR
lx,
UV
lx,
R1
6x,
Y3
2x,
NO
4x
.
Hood:
Bui
lt
-in
Tr
i
pod
Mount
: Detachable
Size and
We
i
ght
:
Max
i
mum
diameter
94mm,
length
282mm,
weight
l,300g
(tripod
mount
100g)
Accessories: Lens cap
(commonly
used wi
th
the
F
D85
-
300mm
f/4.5
lens,
94mm
<1»,
exclusive
filter
(with
a
holder),
exclusive lens
case
.
Subject
to change
without
notice
.
Built
-in
Hood
1'Jl.i6~
7
-
I-"
Focusing
Ring
7
;t
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Y:..-:7
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:..-~
Lock
Pin
amera
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Index
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Camera
Position
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Distance Scales
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§~
Istance
Index
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7-(
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Clamp
Adjustment
Screw
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Mounting
on
the
Cameras
This lens can
be
mounted
or
dismounted
like
the
other
FD
lenses.
First
remove a
dust
cover
from
the bayonet ring, then
mount
the
lens
on the camera
body.
The bayonet ring
cannot
be rotated when the lens
is
dismounted
from
the camera
body
and
left
without
a dust
cover. When
the
lens
is
mounted
on
the
camera
or
the
dust
cover
has
been attached,
the
bayonet
ring can be rotated.
To
mount
the
lens on
the
camera
body,
please
rotate
this
bayonet
ring all
the
way
until
it
stops.
Filter Setting
There are
five
kinds
of
filters:
REGULAR
1
x,
UV
1 x, R 1
6x,
Y3
2x
and NO
4x.
The
filter
is
fixed
on the
holder
and
it
can
be
unlocked
by
pressing a pin
type
lock on the
filter's
top.
Simply
insert
the
filter
holder
into
the
filter
slot in the rear
part
of
the
lens barrel
to
automatically
lock
it
. When removing
the
filter
holder
from
the
lens barrel,
press
down
the lock pin
with
your
forefinger
and
pull
out
the
holder
using
your
thumb
and
middle
finger gripping
both
ends
of
the
holder.
Since this lens
is
designed
to
include
the
filter,
8
it
always
has
to
be
used
with
the
filter.
With
-
out
the
filter,
the
light
coming in may
affect
the
picture's
image. Therefore, even when
a
filter
effect
is
not
necessary,
the
filter,
REGULAR
lx
should
be
inserted.
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10
Tripod Mount
The
tripod
mount
is
designed
both
for
fixing
the
camera on
the
tripod
for
photography
and
for
better
balance in hand-held shooting.
When the clamp adjustment screw
is
loosened
counterclockwi~e,
the
tripod
mount
can
be
rotated around the lens barrel
so
that
the
camera
can
be
fixed
horizontally
and ver-
tically
.
Please
use
the
camera
position
indices
marked
on
the
mount
and
on
the
lens barrel
when setting the position. (The
horizontal
position
can
be
set according
to
the
distance
index.)
The
tripod
mount
can
be
opened
by
loosening
the
clamp adjustment screw
for
cleaning
or
changing
the
angle
of
attachment.
Hand-Held Shooting
Put
the
tripod
mount
on
the
palm
of
your
hand and focus using
your
fingertips.
Built-in
Hood
Please
make
use
of
the
built-in
hood
by
pulling
out
fully
.
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12
Focusing
Rotate
the
focusing ring.
Even
in
distance scales greater
than
15
meters,
the
focusing scale was set
to
increase gradually
to
make
the
use
of
this scale easier.
There
is
some allowance when set
at
infinity con-
sidering
the
focusing changes
due
to
low tem-
perature, so please make sure
to
focus while
looking through
the
viewfinder
at
infinity.
Depth
of
the
Field
The
scales for
the
depth
of
the
field are read
diff.erently as
the
speed
at
which
the
focusing
mechanism moves
is
changed
in
order
to
lengthen
the
intervals between
the
distance
scales more
than
15m. This
is
a different
system from
the
conventional helicoid
type.
The
indicated scales are from
15
meters sub-
ject distance up
to
infinity:
the
length will
be half when less
than
10
meters.
For
ex-
ample, f
/22
is
in
between 16 and 8, and 16
is
equal
to
the
position
of
8. However,
as
this
lens has a focal length
of
400mm,
the
depth
of
the
filed
is
very shallow requiring careful
focusing.
Infrared Index Mark
The infrared index mark
is
read like the·
depth-of-field scales. Under 10 meters, it
is
between 8 and 16. The infrared index mark
in
red
is
a focusing correction index mark for
use with black and white infrared film and a
red filter.
If
the
focus
is
adjusted
to
the
scale
of
20
meters, rotate
the
focusing ring
to
the
number
20
on
the
distance scale matching
the
red· index mark. This
is,
however,
not
applied when color infrated film
is
used.
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Various Couping Mechanisms
The
coupling mechanisms
of
this lens are
similar
to
the
other
FD
lenses. When
the
dust
cover
is
removed from
the
lens,
the
lens
cannot
be stopped down just by moving
the
automatic
aperture lever,
nor
can
the
bay-
onet
ring be rotated. These coupling
mechanisms work only when
the
lens
is
mounted
on
the
camera body.
The
following
description fills you
in
on these coupling
mechanisms:
1. Aperture Signal Lever
This lever transmits
the
automatic
preset
f/stop
to
the
exposure meter. It
is
coupled
to
the
preset aperture ring
in
the
same
proprotion. I n
the
case of
AE
photo-
graphy,
the
f/stop
value
is
determined by
the
signal received from
the
camera.
2.
Full
Aperture Signal Pin
This pin transmits
the
f/stopat
a full
aperture opening.
3.
Automatic
Aperture Lever
This lever stops down
the
aperture
to
the
preset position. When this lever
is
turned
clockwise
all
the
way, it will be locked
tor
manual aperture. Usually, manually ope-
14
rated
aperture
is
performed by pressing
the
stopped-down coupling lever
in
the
camera body.
4.
EE
Lock Pin
This pin locks
the
aperture ring of
the
lens
at
the
"A"
mark position. When using the
camera as designed for
AE
photography,
set
the
"A"
mark
of
the
aperture ring
to
the
aperture index while you press
the
EE
lock pin. This pin can only be used for
the
above purpose.
5.
EE
Switch Pin
When
the"
A"
mark of the aperture ring
is
set
to
the
aperture index,
the
EE
switch
pin comes
out.
But, this setting only allows
the
lens
to
be mounted
on
the
cameras
designed for
AE
photography.
6 Reserved Pin.
Aperture
Signal Lever
~
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-(
-
Full
Aperture
Signal Pin
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Automatic
Aperture
Lever
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