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500nm Interference Bandpass Filter, 12.5mmdia x 70nmBW

Only 3 left in stock
SKU: 500DIW12
More Information


Diameter (mm) 12.5
Thickness (mm) 6.1
Avg. Blocking OD 5
Avg. Blocking Range 200nm to 1150nm
Blocking Type Dielectric
CWL(nm) 500
Mounted/Unmounted Mounted
Peak Transmission (%) 70

Knight Optical's broadband and extra broadband range of interference band-pass filters are used to isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths.

Our stock range of high quality visible and NIR filters is available from 400nm - 940nm in various bandwidths to meet most requirements from ANPR imaging to CCTV and high-end surveillance systems. Typically, our filters are 3-7 cavity and in most cases blocking is metal dielectric from 200nm to FIR (3000+nm) at OD4. This broadband range of interference bandpass filter has a standard 60-70% transmission.

All individual mounted interference filters are CNC scribed and hermetically sealed to form a stack in their rings, ensuring maximum long-term stability. Although our standard stock range is mounted, un-mounted types with aerospace paint blackened edges can be supplied at request. 

Our filters are available on short lead times directly from stock, or as custom products designed to fit your specific application. For more information please contact our technical sales team with your requirements.

Diameter & Aperture (mm):

Thickness (mm):

CWL Tolerance (nm):

HBW Tolerance (nm):
Optimum Operating temperature:
Edge Treatment:
Edge Marking Format:

Surface Quality:
Usable Temperature Limits:
Design Type:
12.5mm ± 0.2 (8.5mm aperture)
25.0mm ± 0.2 (21mm aperture)
50.0mm ± 0.2 (46mm aperture)
6.1mm +/-0.2
<0.01% (OD4) @ 200nm to 1150nm (for filters with CWL less than 380nm)
<0.001% (OD5) @ 200nm to 1150nm (for filters with CWL between 380nm and 1064)
<0.001% (OD5) @ 200nm to 1850nm (for filters with CWL between 1080nm and 1640)
± 20% of FWHM
± 20% of FWHM
Mounted in black anodized aluminium ring
In most cases {Knight Optical Part#} - {KOLTD} - arrow in direction of light path
-50°C to +80°C
Typical 3 cavity design
All filters are scribed and hermetically sealed to ensure maximum long-term stability
(Information sheet on scribed interference filters)

Please telephone our technical sales or email with your specification.

Dielectrically blocked filters are available for increased performance.
Stock filters can be supplied in pre-mounted threaded rings.
Other bespoke sizes to your specification either mounted or un-mounted.
Unmounted interference filters available, sealed around edges with high quality aerospace paint.
Small one-off or small batch quantity for new projects at very competitive prices and normally delivered within 6 weeks.
Alternative imperial sizes are available at short notice, normally within 1-2 weeks.
12.7mm dia: 8.7mm dia aperture
25.4mm dia: 21.4mm dia aperture
50.8mm dia: 46.8mm dia aperture


Information sheet: Interference filter terminology

Information sheet: Scribed interference filters