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Leitz / Leitz Wetzlar Extender-R 2x

Teleconverter • Film era • Discontinued

Specification

Production details
Announced:1980
Production status: Discontinued
Order No.:11236 - for Leica R cameras
11237 - for Leicaflex SL/SL2
Original name:LEITZ WETZLAR EXTENDER-R 2x for LEICAFLEX SL/SL2
LEITZ WETZLAR EXTENDER-R 2x for LEICA-R
LEITZ EXTENDER-R 2x FOR LEICAFLEX SL/SL2
LEITZ EXTENDER-R 2x FOR LEICA-R
System: Leica R (1964)
Optical design
Magnification factor:2x
Maximum format:35mm full frame
Mount:Leica R
Lens construction:5 elements - 4 groups
Physical characteristics
Weight:180g
Maximum diameter x Length:⌀62×30mm
Weather sealing:-
Fluorine coating:-

*) Sources of data: Leica R4-MOT booklet (PUB. 121.111-136) (August 1980) ● Useful accessories for the LEICA R4 (PUB. 113-131) (February 1982) ● Handbook of the LEICA system (PUB. 100-021) (May 1987).

Manufacturer description #1

The Extender-R is designed for all LEICA-R lenses, from 50mm to 800mm focal length, and an aperture ratio of 1:2.

It is a carefully designed optical system based on the use of special, highly refractive Leitz' own glasses. By expending a high degree of optical material and design, maximum coordination was achieved between the extender and the LEICA-R lenses. Even fully open the image quality achieved via the extender is remarkable. It may be improved when the lens is stopped down by two "f" stops.

The extender doubles the focal length of the lens used. The diaphragm opening of the lens is reduced by two steps. For instance, a 60mm f/2.8 lens becomes a 120mm f/5.6 lens with the extender. Exposure determination of the LEICA R4-MOT considers these changed values automatically. The extender contains an automatic-diaphragm transfer mechanism. The time automatic (shutter preferred) or manual modes of exposure determination are feasible without restriction.

Manufacturer description #2

The EXTENDER-R has been designed for all LEICA R lenses from 50 to 800mm focal length and maximum apertures from f/2.

It consists of a complicated optical system, based on special highly refractive LEITZ glasses. Optimum adaptation to the LEICA R lenses has been achieved with the sophisticated optical design. The optical performance of the EXTENDER is remarkable even at full aperture, and can be further improved when the lens is stopped down by 1 to 2 stops.

The EXTENDER doubles the focal length of the lens with which it is used. The aperture set on the lens is reduced by 2 stops. Thus the EXTENDER converts a 50mm f/2 into a 100mm f/4 lens. The exposure measurement of the LEICA R4 automatically allows for the changed values.

The EXTENDER has a fully automatic diaphragm transmission. Automatic shutter speed control as well as manual setting of shutter speed and lens stop can be used without restriction on the LEICA R4.

From the editor

The list of compatible lenses shows only those lenses that were listed in the manufacturer booklets during the production period of this extender (1980-1994). Lenses with a focal length of 50mm or larger and a maximum aperture of f/2 or smaller, discontinued at the time of introduction of this extender, are most likely also compatible.

Compatible lenses (20)

2.0 Leitz Canada / Leica Summicron-R 50mm F/2 [II] E55 1976 
2.0 Leitz Canada Summicron-R 50mm F/2 Safari E55 1977 
2.0 Leitz Canada Summicron-R 50mm F/2 “LHSA 10th Anniversary” E55 1979 
2.0 Leica Summicron-R 50mm F/2 “130th Anniversary Nihon Siber Hegner” E55 1995 
2.8 Leitz Wetzlar / Leica Macro-Elmarit-R 60mm F/2.8 [II] E551:2 @ CFD 0.27m 1980 
2.8 Leitz Wetzlar / Leitz Canada Elmarit-R 90mm F/2.8 [I] E55 1964 
2.8 Leitz Canada / Leica Elmarit-R 90mm F/2.8 [II] E55 1984 
2.0 Leitz Canada / Leica Summicron-R 90mm F/2 1970 
4.0 Leitz Wetzlar / Leitz Canada Macro-Elmar-R 100mm F/41:3 @ CFD 0.6mPro 1978 
2.8 Leica APO-Macro-Elmarit-R 100mm F/2.8 E601:2 @ CFD 0.45mPro 1988 
2.8 Leitz Canada / Leitz Wetzlar / Leica Elmarit-R 135mm F/2.8 [II] 1968 
4.0 Leitz Wetzlar Elmar-R 180mm F/4 E55 1976 
4.0 Leitz Wetzlar Elmar-R 180mm F/4 Safari E55 1977 
3.4 Leitz Canada APO-Telyt-R 180mm F/3.4Pro 1975 
2.8 Leitz Wetzlar Elmarit-R 180mm F/2.8 [II] E67 1980 
4.0 Leitz Wetzlar / Leitz Canada Telyt-R 250mm F/4 [II] E67 1980 
2.8 Leica APO-Telyt-R 280mm F/2.8 E112Pro 1984 
4.8 Leitz / Leitz Canada Telyt-R 350mm F/4.8 E77Pro 1980 
2.8 Leica APO-Telyt-R 400mm F/2.8Pro 1992 
6.3 Leitz Wetzlar Telyt-S 800mm F/6.3Pro 1973 

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35mm full frame

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

Travellers' choice

Note

Among autofocus lenses designed for 35mm full-frame mirrorless cameras only. Speed of standard and telephoto lenses is taken into account.

One of the best

According to lens-db.com; among lenses designed for the same maximum format and mount.

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Unique Leica Look

Leica lenses are one-of-a-kind optical masterpieces that are impressive because of their unique Leica Look. This is ensured through exceptional optical design combined with selected materials and the highest quality standards.

Leica lenses reveal their full potential only when mounted on Leica cameras, since only these have sensors precisely matched to their optical characteristics.

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

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),

where:

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

Mount

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.

Speed

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.

Electromagnetic diaphragm control system

Provides highly accurate diaphragm control and stable auto exposure performance during continuous shooting.

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.

Weight

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.

Filters

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

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.