Neutral Density Filters

Neutral Density (ND) filters uniformly reduce light intensity across a broad spectral range without affecting colour balance.

MidOpt neutral density filters are available in absorptive and low-reflectivity designs for visible and near-infrared imaging applications.

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Neutral Density Filters

Absorptive ND Filters

ND030 ND060 ND090 ND120

Low Reflectivity NI Filters

NI030 NI060 NI090 NI120

Light reduction

Reduces the amount of light reaching the image sensor.

Improved depth of field control

Allows wider iris openings and longer exposure times.

Visible and near-IR options

Available for visible-only and broadband imaging applications.

Low reflectivity coatings

Minimises back reflections while maintaining broad spectral transmission.

What is Optical Density?

Optical Density (OD) is a measure of how much light is blocked by a filter.

OD = -log10(T)

A filter with 1% transmission has an Optical Density of 2.

ND030 Neutral Density Filter

Optical Density 0.3 (50% transmission)

ND030 filters reduce light intensity reaching the sensor, allowing longer exposure times and reduced depth of field.

These filters are commonly used to improve subject separation from the background in machine vision and imaging applications.

ND030 filters are sometimes referred to as “2X” filters and include male and female threads for stacking.

ND030 Neutral Density Filter
Specification Details
Optical Density 0.3
Transmission 50%
Spectral Range Passes 380nm and above
Suitable For Longer exposure and reduced depth of field applications
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ND060 Neutral Density Filter

Optical Density 0.6 (25% transmission)

ND060 filters reduce visible light transmission to approximately 25%.

These filters support longer exposure times and improved background separation in imaging applications.

ND060 filters are commonly referred to as “4X” filters and support filter stacking configurations.

ND060 Neutral Density Filter
Specification Details
Optical Density 0.6
Transmission 25%
Spectral Range Passes 389nm and above
Suitable For Reducing light intensity for imaging systems
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ND090 Neutral Density Filter

Optical Density 0.9 (12.5% transmission)

ND090 filters transmit approximately 12.5% of visible light while maintaining neutral colour balance.

These filters improve separation of subject matter from the background through exposure and iris control.

ND090 filters are also referred to as “8X” filters.

ND090 Neutral Density Filter
Specification Details
Optical Density 0.9
Transmission 12.5%
Spectral Range Passes 390nm and above
Suitable For Exposure control and subject isolation
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ND120 Neutral Density Filter

Optical Density 1.2 (6.3% transmission)

ND120 filters significantly reduce light intensity for high brightness imaging applications.

These filters are often used for viewing into lamps, furnaces and bright industrial processes.

ND120 filters are commonly referred to as “16X” filters.

ND120 Neutral Density Filter
Specification Details
Optical Density 1.2
Transmission 6.3%
Spectral Range Passes 395nm and above
Suitable For Lamps, furnaces and bright process viewing
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Low Reflectivity Neutral Density Filters

NI030 Low Reflectivity ND Filter

Optical Density 0.3 low reflectivity filter

NI030 filters provide uniform attenuation across the visible and near-infrared spectrum.

Reflection-inhibiting vacuum evaporated coatings minimise undesirable back reflections while maintaining broad spectral transmission.

These filters are suitable for broadband light attenuation, laser attenuation and inspection system shrouding applications.

NI030 Low Reflectivity Filter

NI060 Low Reflectivity ND Filter

Optical Density 0.6 low reflectivity filter

NI060 filters provide low reflectivity attenuation for visible and near-infrared imaging systems.

Uniform spectral attenuation and low expansion glass construction improve durability and thermal stability.

NI060 Low Reflectivity Filter

NI090 Low Reflectivity ND Filter

Optical Density 0.9 low reflectivity filter

NI090 filters reduce transmission while maintaining uniform visible and near-IR attenuation.

Ideal for industrial CCD/CMOS imaging applications requiring low reflectivity performance.

NI090 Low Reflectivity Filter

NI120 Low Reflectivity ND Filter

Optical Density 1.2 low reflectivity filter

NI120 filters are designed for very bright imaging environments including lamps, furnaces and welding applications.

Reflection suppressing coatings and broadband attenuation improve performance across visible and near-IR wavelengths.

NI120 Low Reflectivity Filter
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Need help selecting neutral density filters?

Talk to our machine vision engineers about exposure control, broadband attenuation and industrial imaging filter solutions.

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