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You are here: Home » ND Filter : Types and Uses

By Abhishek Ghosh July 26, 2013 3:23 pm Updated on July 26, 2013

ND Filter : Types and Uses

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ND Filter or neutral density filter is a filter that reduces the intensity of all wavelengths of light without changing the color. It allows to use a wider aperture. ND filter is basically a single piece combined glass or plastic plates of optical quality, which is screwed before the lens of the camera to achieve uniform darkening of the image. Gray filter / ND filter are also used for movie camera. It is homogeneously colored neutral gray, so the color reproduction is not distorted.

 

Basic Details and Types of ND Filter or neutral density filter

 

Standard types of ND filters have a Filter factor of 2, 4 or 8; (filter factor refers to the multiplicative amount of light a filter blocks) the ND filter gets the designation “ND 2X”, “4X ND” or “ND 8X”, on their body. ND filter also expressed as NDX Filter (Neutral Density) or ODx (optical density), where x is specified with a trailing number. When the large “X” is missing and the factor name is indicated with a decimal, for example in “ND 3.0”, then this indicates to the logarithmic scale by the following damping formula : The strength of the attenuation calculated from the logarithm of the ratio of the incident intensity and the intensity measurable by the ND filter.

 

Vim
1
?=?log I1/I0

 

There is table that shows the common names of NDX (in logarithmic scale), the indication of ND, X (x-fold prolongation of the closure time, in linear scale) and the number of stops around which the amount of light decreases. ND 0 corresponds to no filter effect, polarizing filter lying around is ND 0.45 and 8.0 represents a weakening of the intensity by a factor of 10 = 100,000,000 8th. Alternatively, ND2 is named as Half , ND4 is Quarter  and so on.

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The transition area, is available with different variations like soft, hard, attenuator. The most common is a soft edge and it provides a smooth transition from the ND side and the clear side. Hard edge grads have a sharp transition.

 

Usages of ND Filter

 

A basic practical idea can be understood from our guide to Long Exposure Photography with Neutral Density Filter. This is a guide for fine tuning a particular usage.

ND-Filter-Types-and-Uses

In photography, the reduction of the incident light through the lens a given film speed, according to the set film speed can be too bright and the the lens is not enough to avoid overexposure or desired aperture value or the shutter speed can not be maintained. This can be the case when you want a long exposure or a wipe-out effect.

Movement of falling water photographically requires 1/60 sec exposure time or longer. The light is too so bright and / or the film speed required is so high that despite the smallest possible aperture for the correct exposure on a given lens can not be adjusted, a ND filter is used instead. Especially in architectural photography, disturbing peoples or vehicles moving in front of the building do not get blurred out. Also you can extend the exposure time so that the threshold of the used neutral density filter is below the level to create any change on the sensor / film and the persons or vehicles in the image are not visible.

 

Abhishek-Ghosh Tagged With types of nd filters , which nd filter , which nd filter to use , nd camera filter , types of nd filter , nd lens filter instead of cto on window ? , nd filters for windows blown out , nd filters for windows , nd filter types , how to have a uniform density color filter

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "ND Filter : Types and Uses," in The Customize Windows, July 26, 2013, February 6, 2023, https://thecustomizewindows.com/2013/07/nd-filter-types-and-uses/.

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