Front Lens Filter
Fresnel lens - the best parter of infrared rays sensors
Fresnel lenses are generally used as a ray concentrators like conventional convex lenses, but it's much thinner and lighter. For that reason, It has been universally used in taillights or OHP (overhead projector) to concentrate rays of light into focus.
As conventional lenses, most of fresnel lenses are also made of plastic. However, Seoul Precision Optics Co., Ltd.(http://www.spocc.com), a global manufacturer of optical coatings for electronic, optical, lighting and industrial applications, has successfully developed new version of fresnel lenses made of silicon wafer to use it for infrared rays sensors.
Contrary to plastic lenses, wafer lenses can be penetrated by infrared rays so that it can be highly sensitive by concentrating infrared rays in the presence of infrared rays sensors. Infrared rays sensors are generally applied to cars or ear clinical thermometers.
Also Seoul Precision Optics Co., Ltd. has enhanced its functions by using progressive spattering technology suited to micro mini lens, filter coating unlike electronic beam method. Since the performance of the lens can be calculated based on coating degree, it can be controlled as you want and developed up to three times.
With the increasing demand for infrared rays sensors, Sim Munsik ,the head of Seoul Precision Optics Co., Ltd., expects the great demand for fresnel lenses which will enhance functions of infrared rays sensors clearing out any technical deficiencies.
About Seoul Precision Optics Co.
Through cutting edge technology and methods, Seoul Precision Optics. Co has provided high quality optical coating offering customers an uncommon collection of technical depth,
personalized service, and competitive pricing that enable customers to reduce the cost.
Also the company has applied its superior technology and methods to customers application for many years. For more information, visit http://www.spocc.com/ or email sales@optical-coating.com
About the Author
Where to place UV filter Behind or In front of lens?
I have two lens for my HD camcorder, Each lens has a different thread so will need to purchase two lots of filters.
Or can I just place the UV/PL filters directly on the camcorder and then attach the lens on top?
Will this affect the way the picture looks?
Thanks
You need to put the filter on the front of the lens. Putting the filter in between the lenses is defeating the purpose of the filter (will lose the protective feature of the filter as well as the effectiveness of the filter).
sal1855_rotating front lens & polarizing filter
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