Black Hole Hektor 5 25

Black Hole Hektor 5 25
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Leitz Hektor 50mm F/2.5 Standard prime lens • Film era • Discontinued
LEICA lenses HEKTOR 28/6.3 , ELMAR 35/3.5 , HEKTOR 50/2.5 , ELMAR 50/3.5 [I] , [II] have the aperture scales engraved on the front of the lens mount. The iris is opened and closed by adjustment of a small finger-piece engraved with an index line. On all other LEICA lenses the diaphragm is controlled by means of a milled ring. 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.

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Unique Leica Look

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

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Lightweight None AquaDura coating
*) Source of data: Scarce manufacturer's technical data + own research.
**) Some basic information is missing in the specification as it was not provided by the manufacturer.
This lens is chosen by those who require additional speed in their normal angle lens. It is also used by many as a "standard" objective for all-around purposes. In collapsible mount.
The "Leitz-Hektor" lens F/2.5, 5 cm. focus meets the wishes of those Leica photographers who desire to obtain snapshots under unfavourable lighting conditions both out of doors and indoors. The Leitz-Hektor lens is not a soft picture producer like many other lenses of this aperture, although it naturally does not quite attain the same crisp definition as the "Leitz-Elmar" lens.
The tubular socket of the "Leitz-Hektor" 5 cm. lens is pulled out for photographing in the same way as the standard lens and locked in a bayonet catch by turning it to the right (clockwise). When the camera is not in use the lens socket is turned to the left and pushed into the camera body.
The first fast lens for the Leica. The standardized screw-mount version. Rangefinder coupled since 1932. Originally in nickel finish, but chrome finish introduced in 1932.
Definition, particularly at the widest aperture, is not quite up to the standard of the ELMAR 50mm, but stopped down to at least F/6.3 it improves considerably.
Landscapes • Cityscapes • Buildings • Interiors • Portraits • Street • Travel photography
Copyright © 2012-2022 Evgenii Artemov. All rights reserved. Translation and/or reproduction of website materials in any form, including the Internet, is prohibited without the express written permission of the website owner.
Among autofocus lenses designed for 35mm full-frame mirrorless cameras only. Speed of standard and telephoto lenses is taken into account.
You are already on the page dedicated to this lens.
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.
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.
Sorry, no additional information is available.
The first Leica hood, for the ELMAR 5cm. In its earliest form it had a simple push-on fit and a rectangular opening at the front. The hood was black and there was an index line on the front part of the barrel to re-align the hood after focusing the lens. By 1933 the opening was round, thus eliminating the need to re-align after focusing. By 1935 the hood had assumed its familiar form with the clamping ring and screw. It was available black or chrome and a chrome version was made by Leitz, New York, and engraved as such. There are many minor variations.
Extendable hood for lenses of focal length 3.5cm to 13.5cm. Outer black sleeve slid over the nickel or chrome graduated sleeve and was locked in position by a set screw. The black lower collar carried the usual clamping ring and screw. Early ones nickel inner sleeve, later ones chrome. Leitz, New York also made an all chrome version. Many variations in engravings: e.g. four focal lengths 13.5cm, 9cm, 5cm and 3.5cm with "Hektor" to the left and "Elmar" to the right of the scale; three focal lengths only with no 3.5cm and only "Elmar" to the left; 13.5, 9 and 5 with two positions for the 5, the lower one having "Hektor" to the left and "Summar" to the right.
Dust cap, for screwing on base of LEICA lens when not in use.
Dust cap, chromium plated, for screwing on base of LEICA lens when not in use.
Spare lens cap, for ELMAR 35mm f:3.5, ELMAR 50mm f:3.5, HEKTOR 50mm f:2.5, SUMMAR 50mm f:2, ELMAR 90mm f:4, ELMAR 135mm f:4.5, HEKTOR 135mm f:4.5.
Spare lens cap, same as ORIFT, chromium plated.
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 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 – 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.
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.
The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.
The distance from the front edge of the lens to the subject at the maximum magnification.
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".
Provides highly accurate diaphragm control and stable auto exposure performance during continuous shooting.
The diaphragm must be stopped down manually by rotating the detent aperture ring.
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.
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.
The camera automatically closes the diaphragm down during the shutter operation. On completion of the exposure, the diaphragm re-opens to its maximum value.
The aperture setting is fixed at F/2.5 on this lens, and cannot be adjusted.
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.).
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.
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.
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.
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.
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.

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