Canon Lens FD400mm Camera Instructions
- June 10, 2024
- Canon
Table of Contents
Lens FD400mm Camera
Instructions
Lens FD400mm Camera
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 characterizes 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.
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 structions. 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 apercu 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 imp 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 acerra 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 choro Matic aberration to a minimum. It promises a sharp picture image in every corner of the film.
Specifications
Picture Size : 24 x 36mm
Lens Construction : 6 elements in 5 groups
Coating: Super Spectra Coating
Angle of View:
Horizontal
Vertical
Diagonal| 5°· 10′
3°30′
6°10′
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Focusing System : 2 elements in 1 group in the rear lens group move by means
of a cam
Distance Scales :
ft 13 to 200 m 4 to 50
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 Infrared 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: Bu ilt-in
Tripod Mount: Detachable
Size and We ight: Maxi mum diameter 94mm, length 282mm, weight l,300g (tripod
mount 100g)
Accessories : Lens cap (commonly used w ith the F D85-300mm f/4.5 lens,
94mm<1», exclusive filter (with a holder), exclusive lens case .
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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, 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.
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 counterclockwise, 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.
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.
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:
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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. -
Full Aperture Signal Pin
This pin transmits the f/stopat a full aperture opening. -
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- 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.
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Documents / Resources
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Canon Lens FD400mm
Camera
[pdf] Instructions
Lens FD400mm Camera, Lens FD400mm, Camera
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