C-Mount specifications

Contrary to the designs of conventional colored glass filters or polymer gels, our long wave pass filters are absorption-free, using thin-film interference technology to emit the richest possible colors. These filters also contain an increased edge steepness between wavelength bands to allow for accurate wavelength measurement.

Lens mount comparison: Left - C-mount lens, Fujinon-TV zoom lens 1:1.2/12.5-75; right - 5.0 - 50mm 1:1.4 1/3 CCTV CS lens, unknown manufacturer.

CS-Mount lens

At Optical Filter Shop, we design our long wave pass (LWP) filters to separate the light spectrum into reflected and transmitted components. Also known as an edge filter, LWP filters contain either a cut-on or cut-off slope that defines the transition between a highly reflective and a highly transmitted region. We use a technologically advanced sputtering method to apply multi-layer coatings to our filters, providing superior durability and stability in the highest-output light settings.

There is one more difference - The aperture control. CS-mount is a succesor to the C-mount and it features a mechanism to automatically control the aperture size. In a similar way to how the M42 screw mount evolved to have an extra aperture close pin, which allowed to you see a bright image while looking through a viewfinder, and close the aperture down to the set value just when taking a photo, CS-mount lenses have electric aperture control. It's an extra cable that goes to the camera body and is terminated with a characteristic 4 pin connector.

c/csmount

However, being CCTV, they all are CS-mount. No problem - I have a lot of CS-mount lenses for them. However, I also have two C-mount lenses - that I would like to use - but no C-mount camera. Fortunately, it's easy to adapt the camera and this is what the post is about.

I got several cameras recently. Most of them are analogue CCTV kind. They have proven useful for a variety of tasks, mainly playing with analogue video, optics and machine vision. The resolution is far from stunning but the image quality is OK and I can easily grab the video from them using a regular TV tuner or video capture card, both of which are extremely cheap and readily available. As most places switch to IP camera based surveilance solutions, the analogue cameras are being sold for scrap prices - some of the ones I have were sold as-is from chests with tens of each kind for an eqiuivalent of $5 a piece (lens included!).

Its purpose is to magnify the real image formed by an objective or intermediate relay system. For this reason, the eyepiece design affects the magnification, ...

CS-Mount Telephoto Lens

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Our engineering team has decades of experience using optical solutions and thin-film technology to develop custom filters specific to your application. Our designers will focus on your requirements by considering operating temperatures, humidity ranges, equipment limitations, manufacturing tolerances and other critical factors. Our top priority is maximizing the performance and improving the efficiency of your operation.

One way of solving that is lens adapters. The C-to-CS is simple - it's just a piece of a tube threaded with the right thread (1-32 UN 2A UTS = 32 threads per inch, 1 inch diameter) on both ends that will move the lens away 5mm from the sensor.

Specifications Allen Key Size 0 9mm Length L1 32mm Length L2 10mm Documents Datasheet.

CS-mount diameter

With that sorted, I decided to open the camera (I've done that many times now, for example to replace the power supply capacitors) by removing the two screws in front. This released the front part that has the lens mount thread and the sensor PCB.

Many of our customization processes involve applying multiple coatings to the same filter to enhance the size and weight. For more complex applications, filter designs can combine to produce the desired effect. Long pass and short pass filters can stack to create a custom bandpass filter.

C and CS mounts are very similar - a C-mount lens will fit a CS-mount camera and vice-versa. The only mechanical difference between them is the flange focal distance, which is the distance between the focal plane and the lens flange.

Cto CS-Mount adapter

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CS-mount camera

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As you can see, the only difference is the distance at which a lens will create a sharp image. In case of C and CS, that distance difference is exactly 5mm. All other mechanical parameters are the same, as seen below

c-mount thread dimensions

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Without matching mounts and lenses, the image will be out of focus, or not recognizable at all - it's either focused in between the sensor and the lens, or behind the sensor entirely.

Camera board · Transparent case · Wide-angle & Macro Effect lens · 32G SD Card · Brass fasteners · USB-A to USB-C cable, 0.25 m (Charging & Data Transfer) · 2 AAA ...

Of course, for different distances of the object, the lens will create a sharp image at different distances on the other side. On the focal plane, only the objects within the depth of field will be in focus, and the focus ring on the lens is there to adjust that. In general, the image will be focused close within the flange focal distance. The combinations of lens and camera types are illustrated below.

Optical Filter Shop stocks a wide variety of LWP filters for performance in the visible (VIS), ultraviolet (UV), infrared (IR) and near-infrared (NIR) wavelengths. We can customize our LWP filters to match your application’s specific wavelength and angle requirements to deliver the targeted blocking you need. In addition to our innovative coatings, we can customize our LWP filters by cutting them into various shapes and sizes.

Whether you need a stock LWP filter, a custom design specific to your operation or a quotation on a high-volume run, the staff at Optical Filter Shop is ready to serve you. Contact us today to learn how we can help your operation succeed.

In a CS camera, the autoexposure circuit controls a driver, which in turn drives the aperture galvo. Unfortunately, the aperture is normally closed, so there is absolutely no light passing through the lens unless the aperture is actively driven.

The CS-to-C is more tricky, as it needs to make the lens appear closer by 5 mm. I was not able to find any of these, but it's entirely possible to build one with a concave lens (it would however introduce aberrations to the image). Both of these are pictured below.

I was not sure how the camera would expose the images without the means to control the aperture on the C-mount lens. I didn't really have any idea how to tackle that, as the Fujinon has a manual aperture ring, and the other Zeiss C-mount lens does not have an adjustable aperture at all. I decided to just give it a try and see what happens. I installed the lens on the camera and I was surprised to see it was exposing perfectly fine, by adjusting the exposure time and/or the sensor gain internally.

The camera is now ready to have a C-mount lens installed and should produce focused images.This concludes the mechanical part of the modification. If you are curious about the camera performance after the mod, check out the second part of this post, where I test various lenses on the camera.

With that out of place I went through my screw drawer and by a strike of luck found two 5mm M2.5 spacers. Their threads were initially too long to fit the existing screw holes but I was able to file them off to a desired length

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With that in mind I came up with a different idea - if I could increase the distance between the lens flange and the sensor by that 5mm, I would essentially convert my CS-mount camera into a C-mount camera without the need for an external adapter ring. There was one detail left to solve though.

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The sensor board is held in place by four M2.5 screws and there are two connectors that carry power, video and control signals to the back IO board. You can also see the power supply inside the camera.

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Our stock LWP filters are the perfect alternative to costly sample fabrication when you need a quick, economic prototype. If we have the filter you need in stock, we can usually ship it out within one business day.

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