Leitz Wetzlar SUMMARON 35mm F/3.5

Wide-angle prime lens • Film era • Discontinued


Model history (4)

Leitz Wetzlar SUMMARON 35mm F/3.5 [LSM] (up to s/n 1,423,140)M6 - 41mA36 1950 
Leitz Wetzlar SUMMARON 35mm F/3.5M6 - 41mE39 1954 
Leitz Wetzlar SUMMARON 35mm F/3.5 [LSM] (from s/n 1,423,141)M6 - 41mE39 1956 
Leitz Wetzlar SUMMARON 35mm F/3.5 with OVUM6 - 40.65mE39 1956 

Features highlight

10 blades


Production details
Production status: Discontinued
Order No.:SOONC / 11005
Original name:Ernst Leitz Wetzlar Summaron f=3,5cm 1:3,5
Ernst Leitz GmbH Wetzlar Summaron f=3.5cm 1:3.5
System:Leica SM (1930)
Optical design
Focal length:35mm
Maximum format:35mm full frame
Mount and Flange focal distance:Leica screw mount [28.8mm]
Diagonal angle of view:63.4°
Lens construction:6 elements in 4 groups
Diaphragm mechanism
Diaphragm type:Manual
Aperture control:Aperture ring
Number of blades:10 (ten)
Coupled to the rangefinder:Yes
Closest focusing distance:1m
Maximum magnification:<No data>
Focusing modes:Manual focus only
Manual focus control:Focusing lever
Physical characteristics
Maximum diameter x Length:<No data>
Filters:Slip-on 36mm
Lens hood:FOOKH / 12505
Lens caps:ORVZO / ORVZOCHROM / 14025 / 66842 (front)
FIRHU / 35252 / 66835 (rear)
ORYFO / ORYFOCHROM / 14050 (rear)
Source of data
Leica lenses booklet (PUB. 1356) (March 1950).

Manufacturer description #1

From the LEICA photography magazine (Spring 1950, Vol. 3, No. 9):


The latest addition to the range of interchangeable lenses supersedes the wide-angle Elmar. The Summaron is of six element construction and gives superb definition over the whole field: it is fitted with click stops; the diaphragm ring is controlled by a knurled quadrant for ease of operation.

Manufacturer description #2

From the LEICA photography magazine (Christmas 1950, Vol. 3, No. 12):

This lens replaces the four element Elmar of the same focal length. It is a Gauss type construction with full emphasis on color correction. Here again the use of a more complicated construction allows wider apertured oblique beams of light to reach the outer parts of the field. The front and rear apertures are almost one and a half times the diameters of those required by the axial beam alone. The lens is capable of an extremely good correction of spherical aberration but the slight undercorrection shown in the diagram helps to restrain overcorrection of the oblique spherical aberration. The indicated amount of undercorrection of astigmatism is also desirable for the same reason.

Manufacturer description #3

Have you ever framed a perfect subject in your finder, only to discover that the angle of view of your 50 mm. lens is too narrow to include the whole scene? And you can't get far enough away to take it in? Well, it's not hopeless! The 35 mm. SUMMARON lens with its wide angle of view will let you shoot in confined spaces, narrow streets, or in front of high buildings, without tilting your camera up or down. The SUMMARON is also popular with press photographers because of its great depth of field which makes the LEICA even faster to operate since it nearly eliminates focusing. For instance, when set to f/8, the SUMMARON reproduces everything sharp from 7 feet in front of the camera to infinity. What's more, its freedom from vignetting is especially valuable in color shots.

Manufacturer description #4

The angle of field of the Leitz 35mm. (1 3/8"), coated F:3.5 wide angle SUMMARON lens is almost 68°, and in spite of the really high aperture of F:3.5, this lens possesses the first-class definition of the other Leitz lenses of different focal length. The great depth of focus makes it possible to avoid setting the lens repeatedly; for instance, at the aperture of F:4.5, sharp focus on all objects between 13 feet and infinity may be obtained by setting the lens to focus on a distance of 26 feet.

Manufacturer description #5

In the group of wide-angle objectives we have the Summaron 35mm., f/3.5 (1 3/8") with an angle of 64-degrees, which is close to the normal observation angle of the human eye. This objective belongs to the Gauss type group and consists of six lenses, two of which are independent; the remaining four are cemented together to form two members. Particularly in the case of wide-angle objectives, care must be taken that vignetting, which has an increasingly disturbing effect with increasing angle of view, is reduced to a tolerable measure. For this reason, the front lens of this objective is also made considerably larger than would correspond to the relative aperture of the system. Moreover, the rear lens of the system is given such dimensions that it additionally enlarges the cross section of the oblique pencils of rays.

The effect of both these design features is that the corners of the image receive much more light, so that vignetting no longer appears. The color correction of this objective is excellent, and other defects are eliminated to a large extent. The performance is, therefore, exceptional even at full aperture. Reduced aperture produces increased resolution and contrast, and between f/5.6 and f/8, a sharpness extending over the entire image area is reached. The depth of field at f/5.6 is so great that the rangefinder need hardly be used.

From the editor

Early version of the Summaron 35mm F/3.5 with serial numbers up to No. 1,423,140.


  • All LEICA lenses having a focusing lever are automatically locked at the infinity position. This feature enables the camera to be used for infinity scenes and subjects without danger of the lens becoming accidentally out of focus due to unintentional movement. To release the lever for focusing on nearer planes press the knob at the end of the lever.

Typical application


Slow full-frame wide-angle prime lens

Genres or subjects of photography (5):

Landscapes • Cityscapes • Buildings • Interiors • Travel photography

Recommended slowest shutter speed when shooting static subjects handheld:

1/40th of a second

Alternatives in the Leica SM system

Sorted by focal length and speed, in ascending order

Lenses with similar focal length

Sorted by manufacturer name

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35mm full frame

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


Sorry, no additional information is available.

FOOKH / 12505 (1951)

As FLQOO but engraved "Summaron - Elmar 3.5cm".


Rear cover, chromium plated, for screwing on base of LEICA lens when not in use.

ORVZO / ORVZOCHROM / 14025 / 66842

Spare lens cap, chromium plated, for lens diameter 36mm: SUMMARON 28mm f:5.6, HEKTOR 28mm f:6.3, SUMMARON 35mm f:3.5, ELMAR 35mm f:3.5, ELMAR 50mm f:3.5, ELMAR 90mm f:4, HEKTOR 135mm f:4.5.

FIRHU / 35252 / 66835

Dust cap, for screwing on base of LEICA lens when not in use.

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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/3.5 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.