Canon Extender FD 1.4X-A

Teleconverter • Film era • Discontinued


Production details
Announced:<No data>
Production status: Discontinued
Original name:Canon EXTENDER FD 1.4x-A
System: Canon FD (1971)
Optical design
Magnification factor:1.4x
Maximum format:35mm full frame
Mount:Canon FD
Lens construction:4 elements - 3 groups
Physical characteristics
Maximum diameter x Length:⌀64×34.6mm
Weather sealing:-
Fluorine coating:-
Sources of data
1. Manufacturer's technical data.
2. Lens Wonderland. Canon FD lens guide book (PUB. C-IE-097AZ).
3. Canon FD lenses sales guide.
4. Lens Work. The Canon guide to interchangeable lenses and Single Lens Reflex photography.
5. Canon Reflex 1981/1982 booklet.

Manufacturer description #1

Use of a Canon extender means a single lens can be increased by a factor of 1.4 or 2, thus allowing one lens to serve the function of two. The FD2x-A, designed for use with 300mm or longer telephotos and the FD 200mm f/4 Macro, can double the focal length of the lens on which it is mounted. It can also be used with zoom lenses which include a 300mm focal length. For lenses (including zooms) which have a maximum focal length of less than 300mm, the FD2x-B gives you a 2x increase in focal length. It is also recommended for use with the FD 300mm f/2.8L. The FD1.4x-A increases 300mm or longer fixed focal length lenses 1.4x. Naturally, all Canon extenders couple with the automatic diaphragm mechanism in the camera, so AE photography can be carried out as usual.

Manufacturer description #2

Each extender is a special accessory, which increases the lens' focal length. Extenders FD 2x-A and FD 2x-B each double the lens' focal length, and Extender FD 1.4x-A increases the lens' focal length 1.4x.

Extenders FD 1.4x-A and FD 2x-A are for use with any FD fixed focal length lens whose focal length is 300mm or longer; FD 2x-A can also be used with any FD zoom lens which has 300mm within its range. Extender FD 2x-B is for use with any FD lens which has a focal length less than 300mm, including any FD zoom lens which does not reach 300mm. The effective aperture of the lens is reduced 2 f/stops with Extenders FD 2x-A and FD 2x-B; with Extender FD 1.4x-A, 1 f/stop. Each extender is equipped with the FD signal pins which enable full-aperture metering, automatic diaphragm coupling and AE photography on Canon SLRs suitably equipped. The advantages of a lens/extender combination are that the lens' minimum focusing distance remains the same, and the optical performance of the prime lens is unimpaired. An ideal accessory when portability is a factor.

Manufacturer description #3

The Canon Extender FD 1.4X Type A is a very special accessory designed to increase the focal length of long telephoto lenses with a minimum loss of light transmission. When added to Canon telephoto or super telephoto lenses, their focal length is effectively increased 1.4X, eg. 300mm becomes 420mm, 600mm becomes 840mm, etc.

Besides being designed for optimum sharpness and high performance with Canon telephoto lenses, the 1.4X Extender requires only one full stop of exposure compensation. Thus, this Extender is ideal for use with Canon lenses such as the ultra-fast FD 300mm f2.8L, FD 400mm f2.8L, and FD 500mm f4.5L.

The Extender FD 1.4X Type A is Super Spectra coated and designed to maintain the high quality and flare-resistant characteristics of Canon telephoto and super telephoto lenses, while maintaining consistent color rendition with the prime lens.

Manufacturer description #4

The FD 1.4X-A is a rear converter designed to step up by 1.4 times the focal lengths of prime lenses with 300mm focal lengths or greater. It shows its maximum optical performance when combined with one of Canon's L-series lenses. While 2 f/stops are sacrificed for the use of the double-power extenders, using the FD 1.4X-A makes it possible for you to enjoy telephoto effects at the price of only one f/stop. Superior engineering in lens shapes and glass materials correct various kinds of aberrations such as image surface curvature aberration, spherical aberration, and coma. This extender combines with multi-coated lenses without generating ghost images and flare, and it transmits all AE information to the camera body.

Compatible lenses (22)

Canon FD 300mm F/5.6 ⌀58Pro 1971 
Canon FD 300mm F/5.6 S.C. ⌀58Pro 1973 
Canon FD 300mm F/5.6 S.S.C. ⌀55Pro 1977 
Canon FDn 300mm F/5.6 ⌀58Pro 1979 
Canon FD 300mm F/4 S.S.C.Pro 1978 
Canon FD 300mm F/4LPro 1978 
Canon FDn 300mm F/4Pro 1979 
Canon FDn 300mm F/4LPro 1980 
Canon FD 300mm F/2.8 S.S.C. FluoritePro 1975 
Canon FDn 300mm F/2.8LPro 1981 
Canon FD 400mm F/4.5 S.S.C.Pro 1975 
Canon FDn 400mm F/4.5Pro 1981 
Canon FDn 400mm F/2.8LPro 1981 
Canon FD Reflex 500mm F/8 S.S.C. 1978 
Canon FDn Reflex 500mm F/8 1980 
Canon FD 500mm F/4.5LPro 1979 
Canon FDn 500mm F/4.5LPro 1981 
Canon FD 600mm F/4.5 S.S.C.Pro 1976 
Canon FDn 600mm F/4.5Pro 1981 
Canon FD 800mm F/5.6 S.S.C.Pro 1976 
Canon FD 800mm F/5.6LPro 1979 
Canon FDn 800mm F/5.6LPro 1981 
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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm
  • Area: 864mm2

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Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.


Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),


CF – crop-factor of a sensor,
FL – focal length of a lens.


A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance can also be different.

The flange focal distance (FFD) is the distance from the mechanical rear end surface of the lens mount to the focal plane.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.


The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Manual diaphragm

The diaphragm must be stopped down manually by rotating the detent aperture ring.

Preset diaphragm

The lens has two rings, one is for pre-setting, while the other is for normal diaphragm adjustment. The first ring must be set at the desired aperture, the second ring then should be fully opened for focusing, and turned back for stop down to the pre-set value.

Semi-automatic diaphragm

The lens features spring mechanism in the diaphragm, triggered by the shutter release, which stops down the diaphragm to the pre-set value. The spring needs to be reset manually after each exposure to re-open diaphragm to its maximum value.

Automatic diaphragm

The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.

Fixed diaphragm

The aperture setting is fixed at F/ on this lens, and cannot be adjusted.

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.


Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front and/or rear lens elements over multi-coatings.


Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.


Teleconverters increase the effective focal length of lenses. They also usually maintain the closest focusing distance of lenses, thus increasing the magnification significantly. A lens combined with a teleconverter is normally smaller, lighter and cheaper than a "direct" telephoto lens of the same focal length and speed.

Teleconverters are a convenient way of enhancing telephoto capability, but it comes at a cost − reduced maximum aperture. Also, since teleconverters magnify every detail in the image, they logically also magnify residual aberrations of the lens.

Lens caps

Scratched lens surfaces can spoil the definition and contrast of even the finest lenses. Lens covers are the best and most inexpensive protection available against dust, moisture and abrasion. Safeguard lens elements - both front and rear - whenever the lens is not in use.