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C-mount is the most common type of lens mount used in machine vision applications. It gains from having access to a huge selection of lenses. Although C-mount is the standard mount for imaging cameras, CS-mount lenses are frequently employed by manufacturers of surveillance cameras and cost-sensitive embedded vision applications. In addition, the shorter flange focal length of CS-mount lenses makes them perfect for designing affordable extreme wide-angle lenses.

Flange Focal Distance (FFD) is the distance from the lens mount flange to the film/sensor. It is also known as flange-to-film distance, flange focal depth, flange focal length (FFL) or flange back distance (FBD). The standard FFD of the C-mount is 17.526 mm. On the other hand, the CS-mount features a flange distance of 12.5 mm, which is 5mm shorter than the FFD of the C-mount, as shown in the following figure.

The maximum practicable sensor size for the C-mount/CS-mount camera is 1.1″ format (17.6 mm diagonal). Moreover, the C-mount and the CS-mount are not appropriate for larger sensors, such as those found in high-resolution cameras, due to their 1-inch (25.4 mm) diameter.

To reinforce, these mounts are mechanical devices that firmly fasten a lens to a camera body. It is of utmost importance to pay attention to even the smallest details while picking a suitable mount type for different products.

The other solution to remove the spherical aberration is to design the shape of the lens to avoid it, these complex shapes are defined by conical equation and are defined as aspherical shapes. Manufacturing of aspheres is more complex, but with recent (last 20 years) digitalisation of the production and testing equipment it becomes easier and cheaper.

Asph lensvs asphericallens

Before looking into the similarities and differences between C-mount and CS-mount, let us understand the threading specifications.

Each mount generally differs from the other by its size, inner/outer diameters, and flange focal distance (FFD). Now, while C-mount and CS-mount almost have the same specifications, the FFD differs.

The mount with a shorter FFD permits the lenses to be placed closer to the sensor. This, in turn, helps lens manufacturers to build simpler and less expensive short-focus lenses.

The pitch is the distance between the thread peaks and is expressed in millimeters. The pitch diameter refers to the diameter of the screw thread, as indicated in figure 1. A pitch of 1 means that each thread is spaced apart by 1 mm.

What is an aspherical cameralensused for

Z stands for the surface (SAG) of the lens R is the Radius of curvature K: Conic constant Ax: Aspheric coefficient of xth order (can be null)

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For instance, e-con Systems’ e-CAM84_CUMI485C_MOD – Ultra-Lowlight Camera Module based on a SONY® STARVIS™ IMX485 sensor includes a CS-mount/C-mount interchangeable lens holder. It provides flexibility in selecting a lens to suit your application needs.

An aspherical lens can be defined as a non spherical lens with at least a one optical face that can be defined following below conical equation.

For a simple image comparison, a spherical lens can be seen as a cut of a sphere whereas an aspherical lens can be defined by more complex shapes, for example conic or elliptic.

C-mounts and CS-mounts are available with the specification of 1-32 TPI UN-2A” in the ANSI B1.1 standard for unified screw threads. Check out the below image for a clear understanding of this specification.

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Aspheric lenses advantages disadvantages

Both C-mount and CS-mount are screw-threaded type lens mounts, which defines their mounting style. These mounts are found in most machine vision cameras and surveillance cameras.

Prabu is the Chief Technology Officer and Head of Camera Products at e-con Systems, and comes with a rich experience of more than 15 years in the embedded vision space. He brings to the table a deep knowledge in USB cameras, embedded vision cameras, vision algorithms and FPGAs. He has built 50+ camera solutions spanning various domains such as medical, industrial, agriculture, retail, biometrics, and more. He also comes with expertise in device driver development and BSP development. Currently, Prabu’s focus is to build smart camera solutions that power new age AI based applications.

Optical breadboards with honeycomb core can be used to expand the useful area of an optical table. Breadboards are of the same sandwich structure as full size ...

Asphericallensphotography

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Fresnel Lenses are a compromise between efficiency and image quality. High groove density allows higher quality images, while low groove density yields better ...

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2011416 — Zeitliche Kohärenz bedeutet, dass sich die Phasenbeziehung zweier oder mehrerer Wellen nicht verändert und infolge dessen eine Welle früher am ...

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20241011 — Diffraction grating, component of optical devices consisting of a surface ruled with close, equidistant, and parallel lines for the purpose ...

ASPHcamera

The CS-mount lens is significantly less expensive than the C-mount since it employs fewer glass elements than the C-mount.

Asphericallenscamera

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A thread form is defined by the standard called Unified Thread Standard (UTS). This standard designates standard thread shape along with allowances, tolerances, and designations. The UTS is commonly used in countries like the United States and Canada for screw threads.

The difference between both lenses comes from their shape, while a spherical lens shape can be defined from a virtual center and a fix radius of curvature, an aspherical lens shape is defined from a virtual center point point but with different values of radius of curvature according to their relative angle.

Lenses create the best image when they are positioned precisely at a distance from the sensor that the optical design permits. Consequently, it’s crucial to confirm that the lens mount and camera mount are compatible.

Spherical lenses are easy to manufacture, but it has been identified by early opticians that using these lenses comes with aberrations on the image, called spherical aberrations. To compensate these aberration one can use doublets or complex systems of lens but this is costly and will take more space and weight.

e-con Systems offers a wide range of high-quality and high-performance C-Mount, CS-Mount cameras and S-Mount (M12) for new-age embedded vision applications. These lens holders support several types of lenses with varied FOVs, focal lengths, apertures, etc.

Asphericallensvs normallenscamera

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There are different methods to measure the surface accuracy of an asphere which can be divided by contact measurements with probes and non contact measurements using interferometers and accessories.

A diffraction grating is some type of substrate on which is etched (or deposited, depending on the method of production) a set of closely-spaced parallel ...

In our previous article, we discussed lens mounts commonly used in embedded cameras – and all the key factors to consider while picking the best lens mount for your application.

Bestasph lens

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A thread class refers to the acceptable range of pitch diameter for the thread. In general, a class defines how loose or tight the threads should be while mating. Thread classes are alphanumeric identifiers that start with a class number 1, as listed in the following table. These classes are followed by the letter suffix “A” or “B” for different design requirements. ‘A’ refers to external threading, and ‘B’ refers to internal threading.

Improvement of production technology has brought a democratization of the use of complex aspherical lenses. What are their benefits, how to manufacture them, see our guide below for answers.

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Each thread in the lens mount is characterized by its pitch and diameter. The following figure shows it consists of a crest, flank, and root as the repeating features along the thread axis.

The C-mount lens is directly compatible with the C-mount camera. It can also be screwed onto a CS-mount camera by inserting a CS-mount adapter (5 mm spacer ring) between the lens and the camera. Nevertheless, using CS-mount on C-mount cameras is not practical as the focal distance of the CS-mount is 5 mm shorter than the focal distance of the C-mount.

If you are interested in integrating C/CS-mount and S-mount cameras into your products, please contact us at camerasolutions@e-consystems.com. Meanwhile, please feel free to check out the Camera Selector to have a look at our complete portfolio of products.

The thread has a diameter of 1″ (25.4 mm) and 32 threads per inch. Both the C-mount and CS-mount have a metric thread of 25.5 mm diameter and pitch of 0.75 mm (M25.5×0.75).

Aspherical Lenses: As opposed to its spherical cousin, an aspherical lens features a surface profile which is less uniformly curvy. Curvature changes as light ...