Dennis Hammett
Camera mounts, also known as lens mounts, are mechanical interfaces that connect a camera body to a lens. They are usually made of metal and are available in different styles, including screw-threaded, bayonet, and breech-lock types. Bayonet mounts are the most common type of lens mount in modern cameras, as they allow for a tight and precise fit, which is crucial for high-resolution cameras. The mount size and flange distance of a camera are important factors in determining the compatibility and performance of different lenses.
| Characteristics | Values |
|---|---|
| Type | Screw-threaded, Bayonet-type, Breech-lock (friction lock) |
| Mounts | S-mount, C-mount, CS-mount, F-mount, T-mount |
| Mount Size | Throat size, inner and outer diameter |
| Flange Focal Distance | 17.526 mm (C-mount), 12.5 mm (CS-mount), 46.5 mm (F-mount), 55 mm (T-mount) |
What You'll Learn
Microscope camera mounts
Camera mounts are usually made of metal.
When choosing a microscope camera mount, it is important to consider the camera's chip sensor size and the microscope model to ensure compatibility and the best image capture. Different microscope-camera combinations may require unique adapters.
In addition to microscope camera mounts, there are also lens adapters available for microscopes, which allow for the attachment of different lenses to enhance the microscope's capabilities.
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Bayonet mounts
Different camera manufacturers may use varying numbers of tabs, mounting directions, mount sizes, and flange focal distances. The flange focal distance is the length from the mounting flange (the edge of the lens mount) to the image sensor or film plane. This distance varies by manufacturer and limits the interchangeability of lenses between camera systems.
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Screw-threaded mounts
While screw-threaded mounts are simple and effective, they have some drawbacks. They are more fragile than bayonet mounts and do not reliably align the lens in a fixed rotational position. This can be an issue when precise alignment is required, especially when using modern high-resolution cameras.
Despite these limitations, screw-threaded mounts are still widely used for other applications, such as video cameras and optical instrumentation. The C-mount interface, for example, is commonly used for video cameras and optical devices.
In summary, screw-threaded mounts are a straightforward and functional choice for camera lens attachment, but they may not offer the precision and durability provided by more modern mount types, such as the bayonet mechanism.
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Breech-lock mounts
Breech-lock camera mounts are a type of lens mount, which is an interface between a camera body and a lens. Lens mounts are usually mechanical, but can also be electrical. They are used to attach interchangeable lenses to cameras, most often single-lens reflex cameras, single-lens mirrorless cameras, or any movie camera of 16mm or higher gauge.
The breech-lock mount gets its name from the mechanisms that lock closed the breech of breech-loading firearms and artillery. It is one of three types of lens mounts, the other two being screw-threaded mounts and bayonet mounts. With breech-lock mounts, the lens is attached to the camera body by means of a rotating ring, which is used to tighten the lens to the camera body by friction. The lens is inserted axially into the body and held in a rotational position, while a locking ring at the rear of the lens is rotated. Recesses in the ring engage 'ears' on the body to lock the lens in place.
The breech-lock mount has some drawbacks. For one, it requires the user to hold the camera body, lens barrel, and breech ring all at the same time, which can be cumbersome and lead to fumbling. Secondly, breech-lock mounts are slower to attach than bayonet mounts.
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C-, T- and F-mounts
C-mounts are commonly found on 16 mm movie cameras, closed-circuit television cameras, machine vision cameras, and microscope phototubes. C-mounts have a male thread that mates with a female thread on the camera. The thread is 1 inch (25.4 mm) in diameter, with 32 threads per inch (0.794 mm pitch). The flange focal distance for a C-mount is 17.526 mm (0.6900 inches).
CS-mounts are similar to C-mounts but have a shorter flange focal distance of 12.526 mm (0.4931 inches). They are typically used for smaller formats of 1/2 inch and below.
F-mounts are bayonet-style mounts that were originally developed for Nikon SLR cameras. They have a diameter of 44 mm and a flange distance of 46.5 mm. F-mounts are commonly used in professional photography, as well as with large area scan sensors, line scan cameras, and large format lenses.
T-mounts, also known as M42-mounts, are used for high-tech cameras with large, high-resolution sensors. They feature a metric thread of 42 mm in diameter and a pitch of 0.75 mm (M42x0.75). The standard flange focal distance for a T-mount is 55 mm.
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Frequently asked questions
Camera mounts are made out of materials such as metal and plastic. The most common type of mount is the bayonet mount, which uses three to four tabs to lock the lens in place.
The different types of camera mounts include screw-threaded mounts, bayonet mounts, and breech-lock (friction lock) mounts. Modern still camera lens mounts typically use the bayonet style.
Camera mounts are used to secure lenses to camera bodies. They are mechanical interfaces that ensure the lens is attached correctly and securely.
Camera mounts use different mechanisms for attaching lenses. Bayonet mounts, for example, use tabs and a spring-loaded pin to lock the lens in place. Screw-threaded mounts, as the name suggests, involve threading the lens onto the camera body.
