Lens mountindex

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Diaphragms are circular (or approximately circular) openings, through which light can travel. They act as intentionally introduced optical apertures, e.g. in photographic objectives. Diaphragms may have a fixed opening diameter, but others have a variable opening diameter (iris diaphragms). Some of the latter can electrically controlled.

Lens mounttypes

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In the simplest case, a diaphragm is a blackened metal plate with a circular hole. If it is small, it is also called a pinhole. There are also devices with a rotatable metallic plate, containing holes of different sizes, so that one can select between them by rotating the plate. Devices of that kind have been used in older photo cameras.

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Lens mountfunction

Diaphragms are also called stops because they stop the light passage in some regions. If they limit the field of view of an instrument, they are called field stops. In other cases, they may act as aperture stops, reducing the amount of light getting through a system.

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Kmountlenses

This table necessarily lacks detail that has important implications. As an example, both Nippon Kōgaku and Cosina have made specialist lenses popularly termed "Nikon F mount" that are much as described below but extend backward so far that the camera's mirror must be locked up; this in turn (i) limits the usable "Nikon F mount" cameras to those that have mirror lock-up and (ii) means that the resulting combination is no longer a SLR. Therefore the table should only be taken as an introductory guide to which lenses work with which bodies.

The square Iris diaphragm is also designed to be compatible for either stand-alone (MID14-24) or 60 mm standard (for example Thorlabs) Cage System (MID14-24C).

The table below lists known camera lens mounts by name, register (Flange Focal Distance), and mechanical description. The table can be sorted by any of these parameters by clicking the sort icons in the table header. The data in this table has been compiled from a variety of sources including our own pages, the Cornell University camera mount list, and William-Jan Markerink's lens flange distance table. See the Links section below for some of our sources.

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Some of those devices are motorized, so that they can be electrically controlled. For example, some modern photographic objectives contain such variable blades diaphragms, so that the microprocessor of the camera can automatically select f-number settings.

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Cameralens mountchart

A lens mount is a mechanical and also sometimes an electrical interface between a camera and a lens that allows cameras to have interchangeable lenses. Still and motion picture cameras, as well as other optical equipment, use lens mounts. Some are unique to a particular device or manufacturer (and protected by patent); for some, the patent has expired; and others again are designed to be shared by cameras from multiple manufacturers.

In contrast to camera manufacturers' desire for incompatibility, consumer demand for interchangeability has driven the development of lens mount adapters and interchangeable mount systems by third-party lens manufacturers. In principle a mechanical lens mount adapter can be created for a camera with a given register (aka Flange Focal Distance or FFD) that will mount lenses designed for cameras of any greater register. Adapting a lens designed for a smaller register either (a) requires an optical adapter (which lowers image quality), or (b) prevents focussing beyond a certain distance. (Even with a greater register, there may be mechanical limitations.)

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The MID14-24 is precise motorized iris diaphragm, which is adjustable either mechanically or on a PC with an intuitive graphical user interface. Our unique design has aluminum blades forming a square diaphragm, always remaining centered to an internal SM1–threaded hole during size tuning. The adjustment step size is ≈10 µm.

Some lens manufacturers specifically design lenses to be relatively easy to convert to any one of several different proprietary mounts.[1]

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CameraLens MountAdapter

Bayonet lens mountcanon

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Some diaphragms are used in beam shutters. They may be optimized such that they can tolerate substantial optical powers.

Most lens mounts fall into one of several categories of mechanical operation: threaded screw, bayonet, or breech lock. A few additional variations or combinations are rarely used such as multi-start threaded screw mounts. The primary motivation for the proliferation of lens mounting systems and the incompatibility between different manufacturers' mounting systems is vendor lock-in; the desire to force a consumer to continuing buying hardware of a given brand by assuring their hardware will not be compatible with other brands.

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Blade diaphragms have an opening of variable diameter, limited by some number of blades, which can be moved towards the center by some distance. There is often a mechanical mechanism, which allows one to move all blades in a coordinated manner e.g. by translating a single handle. The shape of the opening is a polygon, which approximates a circle if the number of blades is large.

Knight Optical have an extensive range of iris diaphragms with steel leaves and housed in blackened brass body. Our catalogue diaphragms are available with a minimum aperture of 0.6 mm up to a maximum 225 mm aperture. Custom diaphragms are also available upon request.

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