Key features of the Longpass Filters
- Average Transmission: 95 %
- Steep slopes
- Wavelength tolerance of interference filters +/- 1 nm
- Ultra low reflection
- Deep blocking / High optical density
Longpass Filters
Block shortwave light up to the cut-on-wavelength
Longpass Filters for the Industry
Schneider-Kreuznach magnetron sputtered industrial longpass filters impress with steep slopes and high transmission at stable cut-on wavelengths. The very flat surface makes them ideal for high end machine vision systems in factory automation. All longpass filters come with superior antireflection coating. Schneider-Kreuznach longpass filters are RoHS conform. Custom sizes are available on request.
What is the function of a longpass filter?
A longpass filter selectively transmits light with longer wavelengths while blocking light with shorter wavelengths. The filter is designed to transmit light that is above a specific wavelength cuton, known as the filter's "cuton wavelength," and to reflect or absorb light that is below this wavelength.
Where is a longpass filter used?
In industrial applications, longpass filters are used to remove unwanted shorter wavelength light from a light source or to separate different wavelengths of light. For example, in fluorescence microscopy, a longpass filter can be used to block the excitation light and allow only the longer wavelength fluorescence emission light to be imaged.
Status
Order name
cut-on Wavelength, 50% [nm]
Type
Filter mounted
Thread size
Thread size
Filter glass unmounted
Diameter
Diameter
Color
Transmission data
Applications & Markets of Longpass filters
Traffic and
surveillance
Traffic and surveillance systems use cameras and image processing to monitor and manage traffic flow and public safety.
3D and 2D
Measurement
3D and 2D measurement uses cameras and image processing to accurately measure the dimensions and geometry of objects.
Bioanalytics and Medical
Bioanalytical and medical applications isolate wavelengths to detect biomolecules and cellular structures.
Mounts for longpass filters
C-Mount
Defined by 1” (25.4mm) diameter and 32 turns per inch pitch, C-Mount thread is a popular camera mount in machine vision industry. Schneider-Kreuznach offers for most filters a CMT mount option. So that filters can go in any C-Mount based mechanics in vision systems.
Another popular application, CMT mounts can easyly be used for, is placing a filter in front of the sensor into the camera. The extension of the back flange distance has to be considered for imaging applications.
Key features:
• Fits in C-Mount cameras
• Black Anodized Brass
Applications:
• To be mounted in C-Mount cameras
• Vision Systems based on C-Mount mechanics
| Thread | Diameter | Clear | Thickness |
| Aperture | |||
| 1'' - 32 | 25.4 mm | 21.1 mm | 3.6 mm |
SH-Mount
Schneider-Kreuznach offers a variety of mounts with common thread sizes to fit on most camera lens systems. SH-Mount is the standard, when high flexibility is needed. Filters are held by retainer rings. SH-Mounts are extreme robust.
All SH-Mounts have a female and male M-thread, and can be stacked if several filters must be combined.
Key features:
• Stackable
• Robust
• Black Anodized Brass
Applications:
• Mounted on lenses in imaging applications
• Mounted on measurement instruments
| Thread | Diameter | Clear | Thickness |
| Aperture | |||
| M 25.5x0.5 | 29.5 mm | 20.8mm | 6.4 mm |
| M 27.0x0.5 | 31.0 mm | 21.8 mm | 6.4 mm |
| M 35.5x0.5 | 39.5 mm | 29.8 mm | 6.4 mm |
| M 37.0x0.75 | 41.0 mm | 31.8 mm | 6.9 mm |
| M 39.0x0.5 | 43.0 mm | 33.8 mm | 6.4 mm |
| M 40.5x0.5 | 44.5 mm | 35.8 mm | 6.4 mm |
| M 43.0x0.75 | 47.0 mm | 37.8 mm | 6.9 mm |
| M 46.0x0.75 | 50.0 mm | 40.8 mm | 6.9 mm |
| M 49.0x0.75 | 53.0 mm | 43.8 mm | 6.9 mm |
| M 52.0x0.75 | 56.0 mm | 46.8 mm | 6.9 mm |
| M 55.0x0.75 | 59.0 mm | 49.8 mm | 6.9 mm |
| M 58.0x0.75 | 62.0 mm | 52.8 mm | 6.9 mm |
| M 62.0x0.75 | 66.0 mm | 56.8 mm | 6.9 mm |
| M 67.0x0.75 | 71.0 mm | 61.8 mm | 6.9 mm |
SN1-Mount
SN1-Mount was designed for in machine vision industry popular M30.5x0.5 thread. With its high clear aperture, vignetting can be avoided, even for wide angle applications. The filter is glued into the mount, in order to secure it against vibrations when integrated into robots or production lines. It is ideal to be used in automated fabrication.
SN1-Mounts have a male and female M-thread, and can be stacked if several filters must be combined.
Key features:
• Maximum Clear Aperture
• No vignetting
• Stackable
• Robust
• Black Anodized Brass
Applications:
• Mounted on lenses in imaging applications
• Mounted on measurement instruments
| Thread | Diameter | Clear | Thickness |
| Aperture | |||
| M 30.5x0.5 | 32 mm | 28 mm | 6.5 mm |
Product highlights
Longpass Filter - Lp 365
The Schneider-Kreuznach LP 365 color neutral longpass filter, formerly "IF 010", keeps unwanted UV light away from the camera and protects the lens from damage. To achieve color neutrality, the filter transmits the entire VIS range from 365 nm to the NIR range.
Longpass filter - LP 430
The LP 430 is a magnetron sputtered interference filter. It is characterised by steep edges that allow only the desired wavelengths to pass. This blocks interfering light below the cut-off wavelength of 430nm. UV light is excluded. NIR light up to about 2000nm can be transmitted. This filter can be used as a protective glass for VIS-NIR lenses as it allows all relevant wavelengths to pass.
Longpass filter - LP 825
The Schneider Kreuznach absorption filter LP 825 blocks all wavelengths below 825 nm and blocks visible light. It allows all wavelengths between 825 nm and 2000 nm to pass. The NIR (near infrared, wavelength ca. 900 nm to 1200 nm) with an average of over 95 %. The filter transmits the SWIR range above this between 1200 nm and 2000 nm with values between 70 % and 80 %.
Environmental Facts of the longpass filters
Our industrial optical longpass filters are tested to DIN standards to ensure they meet stringent environmental requirements. These tests check the durability of the longpass filters, their resistance to temperature changes and their ability to withstand exposure to harsh chemicals and other environmental stressors. This ensures that the longpass filters are up to the task in demanding industrial applications, providing consistent performance and reliability over time.
- Slow temperature cycling
- -25°C - +70°C
5 cycles a 12hDIN ISO 9022-2-14-03 -1
- Damp heat, cyclic
- -23°C - +40°C
80% - 95% rel. humidity DIN ISO 9022-2-16-01-1
- Adhesive tape test
- <<1 s a 25 mm
jerky pull-offDIN ISO 9211-4-02-03
- Chemical resistant
- 24 h
45 g NaCl in 1 | deionised water | 23 ± 2°CDIN ISO 9211-4-04-05
Overview of all Schneider-Kreuznach Products
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MORE optical filters
Looking for more ways to optimize your industrial image processing? Check out our full range of optical filters designed to meet the needs of a wide range of industrial applications. Our selection of high quality optical filters can help you achieve outstanding results in challenging environments while protecting your lens.
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