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Neutral Density Filters
ND or Neutral Density filters uniformly weaken the intensity of light
over a broad spectral range. This is achieved by either absorption using
light absorbing glass or by a combination of absorption and reflection
using a thin-film metal coating and are used to reduce luminous intensity
without affecting colour. Different optical densities (OD)
equate to an overall decrease in luminous transmission.
What is Optical Density?
OD or Optical Density is a measure of how much light is blocked by a filter.
Optical Density-OD = -log10 (T).
A filter with 1% transmission has an OD of 2
| ND030 –
Optical Density = 0.3 (T = 50%) – reduces light intensity |
Model |
Transmission |
Suitable for |
| ND030 |
Passes 380nm and above |
• Improving the separation
of subject matter from the background by reducing the light that reaches
the sensor so as to allow for longer exposure |
| 
Neutral density filters are used to reduce the amount of light reaching
the sensor. This allows for longer exposure times and reduced depth
of field by using a wider iris opening, thus improving the separation
of subject matter from the background.
ND030 single substrate filters (sometimes referred to as "2X"
filters) (Optical Density = 0.30) absorb approximately 50% of visible
light. These mounted filters include identical male and female threads
on either end to facilitate stacking with other filters.
Note: Performance above 700nm varies significantly from lot
to lot. For uniformity in near-infrared applications, careful selection
of batch control is required. If you have special requirements,
please contact Adept. |
| ND060 –
OD = 0.6 (T = 25%) – reduces light intensity |
Model |
Transmission |
Suitable for |
| ND060 |
Passes 389nm and above |
• Applications
where the separation of subject matter from the background is needed
|
Neutral density filters
are used to reduce the amount of light reaching the sensor. This
allows for longer exposure times and reduced depth of field by using
a wider iris opening, thus improving the separation of subject matter
from the background.
ND060 single substrate - sometimes referred to as "4X"
filters - (Optical Density = 0.60), transmit approximately 25% of
visible light. These mounted filters include identical male and
female threads on either end to facilitate stacking with other filters.
Note: Performance above 700nm varies significantly from lot
to lot. For uniformity in near-infrared applications, careful selection
of batch control is required. If you have special requirements,
please contact Adept. |
 |
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| ND090
– OD = 0.9 (T = 12.5%) – reduces light intensity |
Model |
Transmission |
Suitable for |
| ND090 |
Passes 390nm and above |
• Improving the separation
of subject matter from the background by reducing the light that
reaches the sensor so as to allow for longer exposure |
| 
Neutral density filters are used to reduce the amount of light
reaching the sensor. This allows for longer exposure times and
reduced depth of field by using a wider iris opening, thus improving
the separation of subject matter from the background.
ND090 single substrate filters - sometimes referred to as "8X"
filters. - (Optical Density = 0.90), transmit approximately 12.5%
of visible light. These mounted filters include identical male
and female threads on either end to facilitate stacking with other
filters.
Note: Performance above 700nm varies significantly from lot
to lot. For uniformity in near-infrared applications, careful
selection of batch control is required. If you have special requirements,
please to contact Adept. |
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| ND120
– OD = 1.2 (T = 6.3%) – for viewing into lamps |
Model |
Transmission |
Suitable for |
| ND120 |
Passes 395nm and above |
• Improving the separation
of subject matter from the background by reducing the light that
reaches the sensor so as to allow for longer exposure |
| 
Neutral density filters are used to reduce the amount of light
reaching the sensor. This allows for longer exposure times and
reduced depth of field by using a wider iris opening, thus improving
the separation of subject matter from the background.
ND120 single substrate filters - sometimes referred to as "16X"
filters - (Optical Density = 1.20), transmit approximately 6.25%
of visible light. These mounted filters include identical male
and female threads on either end to facilitate stacking with other
filters.
Note: Performance above 700nm varies significantly from lot
to lot. For uniformity in near-infrared applications, careful
selection of batch control is required. If you have special requirements,
please contact us. |
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| NI030
– Optical Density = 0.3 (T = 50%) – Low-Reflectivity,
Neutral Density Filter for Visible and Near-IR Imaging - reduces
light intensity |
Model |
Transmission |
Features |
| NI030 |
Passes 395nm and above |
•
•
• • |
Improves the separation
of subject matter from the background by reducing the amount of
light reaching the sensor
Coated with reflection-inhibiting, vacuum-evaporated protective
overcoat designed to reduce undesirable back reflections while maintaining
uniform transmission over an extremely broad spectral range
Uniform attenuation simultaneously over the entire visible and near-IR
range with the actual percent transmission remaining constant
Low expansion glass substrate material to enhance durability and
resistance to temperature extremes and thermal shock |
| 
NI030 filters are sometimes referred to as "2X"
filters and include identical male and female threads
on either end to facilitate stacking with other filters.
Neutral density filters are used to reduce the amount of light
reaching the sensor, allowing for longer exposure times and reduced
depth of field by using a wider iris opening, thus improving the
separation of subject matter from the background.
Unlike absorptive filter glass and non-reflective neutral density
filters, low-reflectivity NI filters feature uniform attenuation
simultaneously over the entire visible and near-IR range imaged
by most industrial CCD/CMOS cameras, with the actual percent transmission
(or optical density) remaining constant.
These filters also feature a reflection-inhibiting vacuum-evaporated
protective overcoat that is designed to reduce undesirable back
reflections while maintaining uniform transmission over an extremely
broad spectral range. Compared to absorptive neutral density filters,
MidOpt's NI Filters use a low expansion glass substrate material
to enhance durability and resistance to temperature extremes and
thermal shock at no additional cost.
NI Filters are available off-the-shelf in standard threaded mounts,
in thicknesses of 1, 2 and 3mm, and in custom shapes and sizes.
Typical custom applications include reducing transmission from
broadband light sources, low power laser attenuation and partial
shrouding of inspection applications. |
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| •
NI060 – OD = 0.6 (25%) – Low-Reflectivity, Neutral Density
Filter for Visible and Near-IR Imaging - reduces light intensity |
Model |
Transmission |
Features |
| NI060 |
Passes 350nm and above |
•
•
• • |
Improves the separation
of subject matter from the background by reducing the amount of
light reaching the sensor
Coated with reflection-inhibiting, vacuum-evaporated protective
overcoat designed to reduce undesirable back reflections while maintaining
uniform transmission over an extremely broad spectral range
Uniform attenuation simultaneously over the entire visible and near-IR
range with the actual percent transmission remaining constant
Low expansion glass substrate material to enhance durability and
resistance to temperature extremes and thermal shock |
| 
NI060 filters are sometimes referred to as "4X"
filters and include identical male and female threads
on either end to facilitate stacking with other filters.
Neutral density filters are used to reduce the amount of light
reaching the sensor, allowing for longer exposure times and reduced
depth of field by using a wider iris opening, thus improving the
separation of subject matter from the background.
Unlike absorptive filter glass and non-reflective neutral density
filters, low-reflectivity NI filters feature uniform attenuation
simultaneously over the entire visible and near-IR range imaged
by most industrial CCD/CMOS cameras, with the actual percent transmission
(or optical density) remaining constant.
These filters also feature a reflection-inhibiting vacuum-evaporated
protective overcoat that is designed to reduce undesirable back
reflections while maintaining uniform transmission over an extremely
broad spectral range. Compared to absorptive neutral density filters,
MidOpt's NI Filters use a low expansion glass substrate material
to enhance durability and resistance to temperature extremes and
thermal shock at no additional cost.
NI Filters are available off-the-shelf in standard threaded mounts,
in thicknesses of 1, 2 and 3mm, and in custom shapes and sizes.
Typical custom applications include reducing transmission from
broadband light sources, low power laser attenuation and partial
shrouding of inspection applications. |
Back
to Top
| •
NI090 – OD = 0.9 (12.5%) – Low-Reflectivity Neutral
Density Filter for Visible and Near-IR Imaging - reduces light intensity |
Model |
Transmission |
Features |
| NI090 |
Passes 350nm and above |
•
•
• • |
Improves the separation
of subject matter from the background by reducing the amount of
light reaching the sensor
Coated with reflection-inhibiting, vacuum-evaporated protective
overcoat designed to reduce undesirable back reflections while maintaining
uniform transmission over an extremely broad spectral range
Uniform attenuation simultaneously over the entire visible and near-IR
range with the actual percent transmission remaining constant
Low expansion glass substrate material to enhance durability and
resistance to temperature extremes and thermal shock |
| 
NI090 filters are sometimes referred to as "8X"
filters and include identical male and female threads
on either end to facilitate stacking with other filters.
Neutral density filters are used to reduce the amount of light
reaching the sensor, allowing for longer exposure times and reduced
depth of field by using a wider iris opening, thus improving the
separation of subject matter from the background.
Unlike absorptive filter glass and non-reflective neutral density
filters, low-reflectivity NI filters feature uniform attenuation
simultaneously over the entire visible and near-IR range imaged
by most industrial CCD/CMOS cameras, with the actual percent transmission
(or optical density) remaining constant.
These filters also feature a reflection-inhibiting vacuum-evaporated
protective overcoat that is designed to reduce undesirable back
reflections while maintaining uniform transmission over an extremely
broad spectral range. Compared to absorptive neutral density filters,
MidOpt's NI Filters use a low expansion glass substrate material
to enhance durability and resistance to temperature extremes and
thermal shock at no additional cost.
NI Filters are available off-the-shelf in standard threaded mounts,
in thicknesses of 1, 2 and 3mm, and in custom shapes and sizes.
Typical custom applications include reducing transmission from
broadband light sources, low power laser attenuation and partial
shrouding of inspection applications. |
Back
to Top
| •
NI120 – OD = 0.9 (12.5%) – Low-Reflectivity Neutral
Density Filter for Visible and Near-IR Imaging - for viewing into
lamps, furnaces, welding processes, etc. |
Model |
Transmission |
Features |
| NI120 |
Passes 350nm and above |
•
•
• • |
Improves the separation
of subject matter from the background by reducing the amount of
light reaching the sensor
Coated with reflection-inhibiting, vacuum-evaporated protective
overcoat designed to reduce undesirable back reflections while maintaining
uniform transmission over an extremely broad spectral range
Uniform attenuation simultaneously over the entire visible and near-IR
range with the actual percent transmission remaining constant
Low expansion glass substrate material to enhance durability and
resistance to temperature extremes and thermal shock |
| 
NI090 filters are sometimes referred to as "16X"
filters and include identical male and female threads
on either end to facilitate stacking with other filters.
Neutral density filters are used to reduce the amount of light
reaching the sensor, allowing for longer exposure times and reduced
depth of field by using a wider iris opening, thus improving the
separation of subject matter from the background.
Unlike absorptive filter glass and non-reflective neutral density
filters, low-reflectivity NI filters feature uniform attenuation
simultaneously over the entire visible and near-IR range imaged
by most industrial CCD/CMOS cameras, with the actual percent transmission
(or optical density) remaining constant.
These filters also feature a reflection-inhibiting vacuum-evaporated
protective overcoat that is designed to reduce undesirable back
reflections while maintaining uniform transmission over an extremely
broad spectral range. Compared to absorptive neutral density filters,
MidOpt's NI Filters use a low expansion glass substrate material
to enhance durability and resistance to temperature extremes and
thermal shock at no additional cost.
NI Filters are available off-the-shelf in standard threaded mounts,
in thicknesses of 1, 2 and 3mm, and in custom shapes and sizes.
Typical custom applications include reducing transmission from
broadband light sources, low power laser attenuation and partial
shrouding of inspection applications. |
Back
to Top
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