ETAFILM Technology Inc – Product Catalog : Photograpy and optical, Accessories, optics parts

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1. Density Filter

An ideal neutral density filter reduces light of all wavelengths or colors equally. The purpose of standard photographic neutral density filters is to allow the photographer greater flexibility to change the aperture or exposure time, allowing ...

2. Dichroic Color Filter

A dichroic filter or thin-film filter is a very accurae color filter used to selectively pass light of a small range of colors while reflection other. Used before a light source, a dichroic filter produces light that is perceived by humans to ...

3. Band Pass Filter

A band pass filter is a device that passes wavelenths within a certain range and rejects (attenuates) wavelengths outside that range. The working range could be ultraviolet, visible, near infrared, far infrared, optical communication depending ...

4. OLPF Optical low pass filter

Optical low pass filter (OLPF) is used in high end (high resolution) digital camera sensor to eliminate interference influence (Moire pattern) by crystalline birefringency. An OLPF can cut off the undesired high spatial frequency when the sensor ...

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