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Neutral DensityFilter

Technically the filter intensity can also be measured in Transmittance (%), but we will not discuss this nomenclature as it is used only when it is necessary to calculate the optical density mathematically.

In a playful reimagining of traditional lighting principals, Dirk has employed low-resolution 3D printing in the replication Augustin-Jean Fresnel’s eponymous, faceted lens. The newly dictated form sees layers of molten synthetic coils serve to refract and magnify light, to glittering effect.Each fresnel unit houses hundreds of small LEDs. Their luminosity is exaggerated by the printed casing, emanating a diffuse yet sprawling spread of light. The synthetic sources which comprise the shell, such as rooftop windows, chocolate moulds and CDs, appear to crystallize in glasslike new consequence. Combined as a system, the Fresnel light celebrates function in the texture of low-resolution printing.A central, rotating steel ball makes the lamp easy to guide whilst doubling as storage for unused cable. The Fresnel light is available in three sizes. Small Ø36cm, medium Ø52cm and large Ø68cm.LED 46W / 4600 lm and dimmable with a wall switch.lead time: approx 6-8 weeks.Please enquire directly for more information.

Neutral density meaningnd filter

As the light reduction doubles for every further stop reduction, we can say that where “x” is the stop reduction, the filtering factor is equal to “2x“.

Filter Factor is a simple representation of the factor by which the ND or GND filter will reduce the light entering the lens. For example a filter that reduces light by 1 Stop will have a filtration factor of 2 (ND2). 1 Stop light reduction means only half the light will reach the sensor, so its Filter Factor will be 2. You can think it as a fraction: 1/2. ND4 it will be 1/4 (one fourth of the light will reach the sensor).

ND Filter for Mobile

Keep in mind that 1 stop corresponds to an optical density of 0.3. Then multiplying the stops by 0.3, you’ll have the optical density of the filter. For example, 10 stops equals an optical density of 3.0 (10 * 0.3).

ND filtermeaning

The stop reduction is the easiest way to understand the filter intensity as it is a direct measure of the light attenuation towards the sensor. If we mount a filter with reduction equal to 2 stops, to have the same exposure that we would have without a filter, we will have to compensate by 2 stops the exposure with the filter. For example, if without filter we shoot for 1 second and get the desired exposure, with a 2 stop filter we will shoot for 4 seconds (starting from 1″ we add 2 stops: 1″ -> 2″ -> 4″).

When we purchase a ND (Neutral Density) or GND (Graduated Neutral Density) filter, we need to choose the filter intensity we want. However, we often come across abbreviations that are difficult to understand. With this article we will clarify and try to explain what the abbreviations of ND and GND filters mean. What ND1000 / ND 3.0 and ND 10-stop mean?

Optical Density is one of the most common way to identify ND and GND filters, although the calculation is not the most immediate. Without going into the mathematical detail, it will be enough for us to know that the optical density is the logarithm with base 10 of the filter factor.

Neutral densityfilter chart

The fundamental characteristic of each ND and GND filter is to reduce the light reaching the sensor of your camera. Depending on how much the light attenuation is, the filter will have a different intensity. The names and numbers shown on the filter, whatever it is, will indicate the density of the filter.

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Neutral densityfilter Ophthalmology

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Here a practical table that collects all the different names and numbers for NiSi filters. If you are looking for a way to convert exposure times with different intensities you can refer to this article and the conversion table also in PDF.

The confusion in the use of this nomenclature arises from the fact that the numbers indicated are confused with the reduction in Stop, but this is not the case. That’s why when you read ND16 it doesn’t mean that the reduction is 16 stops, but 4!

Although other filter manufacturers sometimes use a specific name or number, NiSi uses all three main existing nomenclatures to facilitate its photographers:

In a playful reimagining of traditional lighting principals, Dirk has employed low-resolution 3D printing in the replication Augustin-Jean Fresnel’s eponymous, faceted lens. The newly dictated form sees layers of molten synthetic coils serve to refract and magnify light, to glittering effect.Each fresnel unit houses hundreds of small LEDs. Their luminosity is exaggerated by the printed casing, emanating a diffuse yet sprawling spread of light. The synthetic sources which comprise the shell, such as rooftop windows, chocolate moulds and CDs, appear to crystallize in glasslike new consequence. Combined as a system, the Fresnel light celebrates function in the texture of low-resolution printing.A central, rotating steel ball makes the lamp easy to guide whilst doubling as storage for unused cable. The Fresnel light is available in three sizes. Small Ø36cm, medium Ø52cm and large Ø68cm.LED 46W / 4600 lm and dimmable with a wall switch.lead time: approx 6-8 weeks.Please enquire directly for more information.