Monthly Archives - September 2018

What is aspheric lens?

An aspheric lens is a lens whose surface profiles are not portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical...

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A Brief Introduction of Optical Filters——Part Ⅱ Types of Optical Filters

There are different classification method of filters. It can be classified according to spectral band, spectral types, bandwidth, wavelength, features of coating, industry application etc. The following will introduce two common classification ways. 1.Classified according to spectral band According to the length of spectrum, filters can be divided into ultra violet...

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A Brief Introduction of Optical Filters——PartⅠDefination and Working Theory of Optical Filters

Filter is a kind of optical element with selective absorption of different bands of light. It is made of plastics or polished and coated glass. Generally, red filters can only pass through red light. The transmittance rate of glass is almost the same with that of air, so all...

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