MidOpt Neutral Density Filters
Neutral Density Filters ND- and Ni-Series
Neutral density filters work like “sunglasses” for your system and can be used with monochrome or colour cameras. Designed to reduce light intensity neutrally over a specific wavelength range without affecting image colour or contrast, these filters can be stacked with each other to test various optical densities. These filters are available in a variety of optical densities, they can help to minimise the pixel saturation and reduce the light intensity while maintaining a wide aperture and a shallow depth of field.
ND series- Visible Spectrum
This filter series is an absorptive series which is effective from 425 - 675 nm and is available in optical density ranges from 0.10 - 6.0
Ni series- Broad Spectrum; VIS/NIR
This neutral density filter series is available in optical density ranges from 0.3 - 1.2 with low reflectivity from 400 - 1100 nm. They are coated on low-expansion, heat-resistant Borofloat® glass.
ND120 Neutral Density Filter - Absorptive 6.25% Transmission
ND030 Neutral Density Filter - Absorptive 50% Transmission
Neutral Density Filters: Visible Neutral Density Filters (ND) and Infrared Neutral Density Filters (Ni)
Neutral Density Filters are primarily used for exposure control, limiting an overwhelming amount of light that might otherwise inundate a subject. They are also used to retain image resolution and reduce depth of field.
- Reduces light intensity without affecting colour
- Reduces depth of field while maintaining same shutter speed
- Can be used with monochrome and colour cameras in the visible spectrum
Learn more about optical filters in our knowledge base
Markets and Applications
Applications include imaging in intense lighting situations (i.e. molten metal and welding), outdoor aerial imaging and photography. Neutral Density Filters help reduce shutter speed to create blur, preventing a “jello” effect in aerial imaging.
| Model | Filter type | Filter mounting | Diameter (mm) | Filter thread | Transmittance (wavelength) | Transmission (%) |
| MIDOPT FIL ND030/72 | neutral density | mounted | M72 x 0.75 | 425 - 675 | 50.00 | |
| MIDOPT FIL ND060/27 | neutral density | mounted | M27 x 0.5 | 425 - 675 | 25.00 | |
| MIDOPT FIL ND060/72 | neutral density | mounted | M72 x 0.75 | 425 - 675 | 25.00 | |
| MIDOPT FIL ND090/25.5 | neutral density | mounted | M25.5 x 0.5 | 425 - 675 | 12.50 | |
| MIDOPT FIL ND090/27 | neutral density | mounted | M27 x 0.5 | 425 - 675 | 12.50 | |
| MIDOPT FIL ND090/72 | neutral density | mounted | M72 x 0.75 | 425 - 675 | 12.50 | |
| MIDOPT FIL ND120/27 | neutral density | mounted | M27 x 0.5 | 425 - 675 | 6.25 | |
| MIDOPT FIL ND120/72 | neutral density | mounted | M72 x 0.75 | 425 - 675 | 6.25 | |
| MIDOPT FIL ND180/25.5 | ||||||
| MIDOPT FIL ND200/20 SLIP | neutral density | slip mount | 20.0 | 425 - 675 | 1.00 | |
| MIDOPT FIL ND200/27 | neutral density | mounted | M27 x 0.5 | 425 - 675 | 1.00 | |
| MIDOPT FIL ND200/30.5 | neutral density | mounted | M30.5 x 0.5 | 425 - 675 | 1.00 | |
| MIDOPT FIL ND300/25.5 | neutral density | mounted | M25.5 x 0.5 | 425 - 675 | 0.01 | |
| MIDOPT FIL ND300/31 SLIP | neutral density | slip mount | 31 | 425 - 675 | 0.10 |
| File | Topics | Size | ||
| Midwest Optical - Using filters in colour inspection, increase resolution through optical filtering | Data sheets |
10.2 MB |