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Since their flange focal distances are different, the C-mount and CS-mount components are not directly interchangeable. However, with an adapter, it is possible to use a C-mount lens with a CS-mount camera.

UV disinfection deactivates living organisms, such as bacteria, viruses, spores, and cysts, but it does not remove particles from water, add chemicals, or remove bad tastes and odors.

C mountvscs mount

Several years ago, the city of Milwaukee flooded, and cryptosporidium infected the water supply. Cryptosporidium, also known as Crypto, is a parasite that enters the intestinal tract and causes illnesses such as Montezuma's revenge. Crypto is resistant to chlorine used to disinfect city water, and the water in Milwaukee resulted in hundreds of deaths. UV water purification protects you from pathogenic organisms that chlorine cannot kill, like cryptosporidium.

Figure 1: C-mount lenses and cameras have the same flange focal distance (FFD), 17.526 mm. This ensures light through the lens focuses on the camera's sensor. Both components have 1.000"-32 threads, sometimes referred to as "C-mount threads".

Handheld UV water purifiers are perfect for backpacking, camping, or traveling around the world. The Steripen by Viqua sterilizes water in seconds without exposing you to UV rays. Handheld UV purifiers come as a single system or as a package with a sediment prefilter for water containing a lot of dirt and debris.

A UV water purifier treats micro-biologically unsafe water with germicidal ultraviolet light. The UV wavelength scrambles the DNA of living organisms in the water so that they can no longer reproduce and make you sick. If you drink bacteria-infested water, the organisms can embed in your digestive tract and replicate. Ultraviolet radiation renders bacteria, viruses, parasites, and fungi unable to replicate by damaging the nucleic acids of their DNA.

UV water purifiers last many years, but they require maintenance like any other water treatment system. However, UV systems are easy to maintain and designed to run continually.

A UV water purifier includes a chamber that encases the quartz sleeve and UV lamp. The glass quartz sleeve holds the UV lamp that emits a germicidal wavelength of radiation (UV-C) to deactivate living organisms. The quartz glass sleeve is transparent to the UV wavelength, which allows UV light to penetrate the glass and disinfect the water. A quartz sleeve protects the UV lamp from the water because water and electricity do not mix well. One or two O-rings seal the whole system together.

UV water treatment is safe. It does not use harmful chemicals or alter the composition of water. A UV sterilizer uses UV-C light to disinfect. UV-C light is harmful to humans just as it is for microscopic living organisms. However, you are not at risk of exposure unless you touch or look at the UV bulb while it is on.

Figure 2: CS-mount lenses and cameras have the same flange focal distance (FFD), 12.526 mm. This ensures light through the lens focuses on the camera's sensor. Their 1.000"-32 threads are identical to threads on C-mount components, sometimes referred to as "C-mount threads."

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UV purification is the best option any time your water contains bacteria or if you want additional protection in the case of a natural disaster. By the time your city water plant issues a Boil Water Advisory, the water has already been contaminated. Having a UV system keeps your water free of harmful viruses and pathogens when the water supply is compromised.

Unlike water filters, a UV water purifier does not remove particles from water. Reverse osmosis systems, ultrafiltration systems, carbon filters, and ceramic filters all separate contaminants from water through tiny pores of a filter or a membrane. UV treatment purifies water by exposing living organisms to ultraviolet light, but it does not filter them out. Water filters do not remove bacteria and viruses with the same effectiveness as UV systems. UV disinfection works alongside water filtration systems to provide clean water.

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If you own a private well or your water is stored in a storage tank, you will need a UV water purifier unless you disinfect your water with chemicals. The well owner is responsible for removing bacteria from water, and ultraviolet treatment is the most effective way to do it. A Rusco spin-down filter is an excellent prefilter for well water before UV disinfection.

UV systems are POE (point-of-entry), which means you install them before water enters your home to purify the water throughout your house. Most of the time, typical household pressure is enough for a UV system to operate. However, a flow restrictor should be used to ensure water does not flow too quickly through the system. Water must be subjected to UV light for a specified time before it is disinfected. If the flow rate is too high, water flows through the UV system too quickly to be considered safe.

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CS-Mount lens

Mixing and MatchingC-mount and CS-mount components have identical threads, but lenses and cameras of different mount types should not be directly attached to one another. If this is done, the lens' focal plane will not coincide with the camera's sensor plane due to the difference in FFD, and the image will be blurry.

It is critical to check the lens and camera parameters to determine whether the components are compatible, an adapter is required, or the components cannot be made compatible.

UV systems are effective at deactivating 99.99% of living organisms in water. They are designed to run constantly to guarantee the water you use is always safe. Because a UV purifier is not a filter, there is no wastewater or debris left behind to clean out. Every drop of water that enters the UV system is purified.

CS Mount Adapter

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Figure 5: A CS-mount lens is not directly compatible with a C-mount camera, since the light focuses before the camera's sensor. Adapters are not useful, since the solution would require shrinking the flange focal distance of the camera (blue arrow).

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UV water purifiers come in a wide variety. The size UV system you need depends on the  flow rate of your water. Sizing according to flow rate allows water to contact the germicidal wavelength long enough to be effective. Like the size, the price of UV systems varies. Typically, a residential UV system costs around $400 or $500.

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Chlorine treatment is an alternative to UV, but ultraviolet treatment is much safer. Ultraviolet light treats water for protozoa that chlorine disinfection is unable to remove. A UV system is much easier to maintain and safer to use than chemical disinfectants. Treating water with chlorine requires a retention tank and precise injections and solutions. Many wastewater treatment plants now use UV water purification to eliminate harmful chemical by-products in water from chlorine or chloramine treatment.

UV lamps run on mercury vapor. The mercury vapor is loaded into a UV lamp in the form of little beads. The mercury vapor created from these beads power the lamp.  Occasionally, you may see beads rolling around in the lamp.

Despite their many advantages, there are a few disadvantages to UV water purifiers compared to other disinfection methods.

UV dosage is the measurement of energy (in mJ/cm²) delivered by a UV water purifier. The more dosage provided, the more energy delivered to treat contaminated water. This energy becomes sufficient at a certain threshold to inactivate most of the microorganisms in water.

Figure 4: An adapter with the proper thickness moves the C-mount lens away from the CS-mount camera's sensor by an optimal amount, which is indicated by the length of the purple arrow. This allows the lens to focus light on the camera's sensor, despite the difference in FFD.

UV purification is not necessary for a water filter, but a water filter is necessary prior to a UV system. UV systems are most effective when water is clear, so they must have at least a five-micron pre-filter to prevent living organisms from hiding behind loose particles. You could use a sediment filter to remove dirt and debris from a well water supply or a water softener to reduce iron as prefiltration. A UV purifier is the last thing water passes through on the way to the house.

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In contrast, the shorter FFD of CS-mount lenses makes them incompatible for use with C-mount cameras (Figure 5). The lens and camera housings prevent the lens from mounting close enough to the camera sensor to provide an in-focus image, and no adapter can bring the lens closer.

With an adapter, a C-mount lens can be used with a CS-mount camera (Figures 3 and 4). The adapter increases the separation between the lens and the camera's sensor by 5.0 mm, to ensure the lens' focal plane aligns with the camera's sensor plane.

Measuring Flange Focal DistanceMeasurements of flange focal distance are given for both lenses and cameras. In the case of lenses, the FFD is measured from the lens' flange surface (Figures 1 and 2) to its focal plane. The flange surface follows the lens' planar back face and intersects the base of the external 1.000"-32 threads. In cameras, the FFD is measured from the camera's front face to the sensor plane. When the lens is mounted on the camera without an adapter, the flange surfaces on the camera front face and lens back face are brought into contact.

Figure 3: A C-mount lens and a CS-mount camera are not directly compatible, since their flange focal distances, indicated by the blue and yellow arrows, respectively, are different. This arrangement will result in blurry images, since the light will not focus on the camera's sensor.

An ultraviolet (UV) water purifier exposes living organisms, such as bacteria, viruses, or cysts (like Cryptosporidium and Giardia) to a germicidal ultraviolet wavelength. With enough energy, UV radiation at the 254-nm wavelength disrupts the DNA in pathogenic microorganisms so they cannot reproduce. The ultraviolet light prevents bacteria from spreading disease through drinking water.

The C-mount and CS-mount camera system standards both include 1.000"-32 threads, but the two mount types have different flange focal distances (FFD, also known as flange focal depth, flange focal length, register, flange back distance, and flange-to-film distance). The FFD is 17.526 mm for the C-mount and 12.526 mm for the CS-mount (Figures 1 and 2, respectively).

1.000"-32 ThreadsImperial threads are properly described by their diameter and the number of threads per inch (TPI). In the case of both these mounts, the thread diameter is 1.000" and the TPI is 32. Due to the prevalence of C-mount devices, the 1.000"-32 thread is sometimes referred to as a "C-mount thread." Using this term can cause confusion, since CS-mount devices have the same threads.

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