Sigmatel MF 135mm F/1.8 (Sigma-XQ)

Medium telephoto prime lens • Film era • Discontinued


Features highlight

8 blades


Production details:
Production status: Discontinued
Original name:SIGMATEL YS 1:1.8 f=135mm
SIGMATEL YS 1:1.8 f=135mm MULTI
Optical design:
Focal length:135mm
Maximum format:35mm full frame
Mount and Flange focal distance:Interchangeable mount (YS)
Diagonal angle of view:18.2° (35mm full frame)
Lens construction:6 elements in 5 groups
Diaphragm mechanism:
Diaphragm type:Automatic
Aperture control:Aperture ring (with or without Auto Exposure setting)
Number of blades:8 (eight)
Closest focusing distance:1.8m
Maximum magnification:<No data>
Focusing modes:Manual focus only
Manual focus control:Focusing ring
Physical characteristics:
Maximum diameter x Length:⌀80×95mm
Weather sealing:-
Fluorine coating:-
Filters:Screw-type 77mm
Lens hood:Screw-type round
Teleconverters:<No data>
Source of data:
Manufacturer's technical data.

Manufacturer description

From the Sigma XQ lenses booket:

The fastest 135mm lens available today having a maximum aperture of F1.8 and equalling the speed of many standard lenses. It has been multicoated so that flare will not diminish its resolving power or lessen its high contrast. An ideal lens for available light photography as well as the stage and sport arenas where flash photography is forbidden.

Although slides taken with 85mm and 100mm lenses are sometimes difficult to distinguish from those taken with a 50mm lens, this is not so with a 135mm lens as the compression of the foreground and background begins to exert itself. The photographer can utilize this effect creatively.

The wide aperture of this lens enables the photographer to perform miracles. For example, have a model lean against a tree on a city block and take the picture with the lens wide open. The depth of field is so shallow when the photographer is a couple of meters from the subject that the background will completely disappear, creating the impression that the model is in a park and not on a city street. Want to freeze sports action? It's easy to shoot at 1/1000 or 1/2000 of a second when you are using an F1.8 lens. And of course the 135mm F1.8 is Scalematic too.

The extremely shallow depth of field, when wide open, and the lens' brightness, as well as its 2.7x magnification make focusing this lens easy.

The six element four group deluxe design of this Sigma lens makes it the optical equal of slower F2.8's or F3.5's.

From the Camera magazine (1972)

A 135-mm Sigmatel f:1.8 (Sigma Corporation, 617 Iwato, Komaeshi, Tokyo 182) is claimed to be the fastest tele lens in this focal length range with automatic aperture control. The lens is available with interchangeable YS mounts to provide meter coupling with most single-lens reflex cameras (including latest models like Pentax Spotmatic ES, Canon F1 etc). The lens is 3 1/2 inches (93.5 mm) long and weighs 23 ounces (715 grams) with a focusing range from infinity down to 6 1/2 feet or 2 metres; there are feet and metric focusing scales. It consists of six elements in four groups and takes 77-mm screw-in filters. The overall diameter of the lens barrel is 3 1/6 inches (80 mm).

From the Optical Spectra magazine (1972)

The Sigmatel 135mm telephoto lens with a lens speed of F/1.8 is reportedly the world's fastest fully automatic 135mm telephoto lens and offers excellent optical quality. It is very compact and light weight, measuring 93.5mm in length when set at infinity with a diameter of 80mm at the widest point, and weighing 715 grams. It has a fully automatic continuous diaphragm with stops to f/22, and utilizes a 4 group, 6 element construction. The closest focusing distance is 2 meters. The lens accepts 77mm screw-in filters and is available with YS interchangeable mounts which work automatically with most 35mm focal plane SLR cameras.

From the editor

Originally introduced as SIGMATEL YS 1:1.8 f=135mm without the Scalematic system. Became MULTI(-coated) around 1973. Later Sigmatels MULTI, photos of which are also shown on this page, were Scalematic. Around 1975, the lens was renamed to Sigma-XQ.

Sigma indicates the closest focusing distance of 2m, but the minimum value on the distance scale is 6 ft. (=1.8m).

Sigma describes this lens as a "six element four group deluxe design", but the optical formula shown in the Sigma XQ lenses booklet includes 6 elements in exactly 5 groups.

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Medium telephoto prime lens

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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 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/1.8 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.