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Sigma[-Z] Pantel 135mm F/2.8

Medium telephoto prime lens • Film era • Discontinued

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Built-in hood

Specification

Production details:
Announced:1975
Production status:● Discontinued
Original name:SIGMA-Z 1:2.8 f=135mm PANTEL
SIGMA 1:2.8 f=135mm PANTEL
SIGMA MULTI-COATED 1:2.8 f=135mm PANTEL
System:-
Optical design:
Focal length:135mm
Speed:F/2.8
Maximum format:35mm full frame
Mount and Flange focal distance:Canon FD [42mm]
Konica AR [40.5mm]
M42 [45.5mm]
Minolta SR [43.5mm]
Nikon F [46.5mm]
Olympus OM [46mm]
Pentax K [45.5mm]
Diagonal angle of view:18.2°
Lens construction:4 elements in 4 groups
Diaphragm mechanism:
Diaphragm type:Automatic
Aperture control:Aperture ring (with or without Auto Exposure setting)
Number of blades:6 (six)
On Nikon D APS-C [1.53x] cameras:
35mm equivalent focal length:206.6mm (in terms of field of view)
35mm equivalent speed:F/4.3 (in terms of depth of field)
Diagonal angle of view:12°
On Pentax K APS-C [1.53x] cameras:
35mm equivalent focal length:206.6mm (in terms of field of view)
35mm equivalent speed:F/4.3 (in terms of depth of field)
Diagonal angle of view:12°
Focusing:
Closest focusing distance:1.5m
Maximum magnification:<No data>
Focusing modes:Manual focus only
Manual focus control:Focusing ring
Physical characteristics:
Weight:422g (mount not specified)
Maximum diameter x Length:⌀67×83mm (mount not specified)
Weather sealing:-
Fluorine coating:-
Accessories:
Filters:Screw-type 55mm
Lens hood:Built-in telescopic round
Teleconverters:<No data>
Source of data:
Scarce manufacturer's technical data + own research.

Manufacturer description

From "How to use your Sigma Pantel" instructions:

Until now the minimum aperture of 135, 200, and 300mm telephoto lenses has been F/22 or F/32. However, even after stopping down a telephoto lens to its minimum aperture, depth-of-field remains relatively shallow. For example, when a 135mm lens is stopped down to F/22 and focused at 8m (26'), neither the background (infinity) not the foreground (4-5m) will be in focus.

The normal minimum aperture of Sigma Pantel lenses is F/22, however, there is an additional click-stop after F/22, (PAN/64), on the aperture ring of the lens. When the aperture ring is set to this position, the aperture is changed, in one stop, from F/22 to F/64, resulting in an enormous increase in depth of field.

MAXIMUM DEPTH-OF-FIELD

When you desire to obtain maximum depth-of-field from your Sigma Pantel, follow the procedure indicated below.

1. Set the aperture ring to the PAN/64 position.

2. Set the focusing ring to the hyperfocal distance (engraved in red in the distance scale).

DEPTH-OF-FIELD SCALES

Appearing directly above the aperture window is the depth-of-field scale which is engraved in white. When desiring to ascertain the depth-of-field for the PAN/64 position, use the PAN 64 marks engraved in red on the depth-of-field scale. For example, when the 135mm F/2.8 lens is focused at 8m (the hyperfocal distance), the infinity mark on the distance scale will be aligned with the left-hand side PAN 64 mark, while the 4m mark on the distance scale will be aligned with the right-hand side PAN 64 mark. This indicates that the depth-of-field will be approximately 4m-infinity.

From the Camera magazine (1976)

The 135-mm Pantel f:2.8 is in many respects a straightforward medium long-focus lens for 35-mm single-lens reflexes. A special feature is an extra small minimum aperture to obtain extended depth of field equal to that available with a standard lens. For this purpose the 135-mm Pantel stops down to f:64 provided by an additional click stop after f:22. (There are no intermediate settings between 22 and 64.) As specified by the manufacturer, the depth of field at f:64 can extend from infinity to 4 metres with the lens focused at 8 metres, while the corresponding depth at f:22 extends from 6 to 12 metres. (This would seem to assume a circle of confusion of around 0.035 mm.) The depth at f:64 thus corresponds approximately to the depth of field of a 50-mm lens at f:22. Naturally the use of this longfocus lens at f:64 requires suitably high subject luminance, or a fast film, or both.

From the Scientific American magazine (1977)

The Sigma Pantel 135mm is more than an ultra-compact, automatic telephoto lens that's perfect for pictures of people and places. It also lets you triple your range of sharpness - instantly, optically. Simply by turning to the unique f/64 aperture position, you expand your depth-of-field (sharpness range) by three times or more, as compared to conventional telephotos. Perfect for those photos where everything from here to there must be in sharp focus. And, Sigma's advanced computer technology and Multi-Layer coating assure razor-sharp, high-fidelity images at every aperture, every time. See the surprisingly economical Sigma Pantel, in mounts for all popular slr cameras.

From the editor

For general information about Sigma Z-series lenses, please refer to the page dedicated to the Z 24/2.8 lens.

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Medium telephoto prime lens

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Table of contents
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Pros and cons
Recommended slowest shutter speed when shooting static subjects handheld
Genres or subjects of photography

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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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MF

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MF

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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

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".

Modified M42 mount

The mount has been modified by the manufacturer to allow exposure metering at full aperture.

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/2.8 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.

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.