Circular variable neutral density filters
Main features
- Wide operational wavelength range (250-2500 nm with UVFS substrate)
- Maintains the transmitted spectral profile
Application examples
- Continuously variable light attenuation over a broad wavelength range
Individuelle Anfrage
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- Description
- Curve
- Standard specifications
Circular ND filters provide continuously variable, linear attenuation of light intensity by rotating the filter around its center. Transmitted intensity varies as a function of the optical density range. The filter can be used for natural light and also for laser applications. By using two filters in reverse configuration one can obtain a fixed density attenuation and extend the number of applications.
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Circular variable neutral density filters
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| Substrate material | BK7 or UVFS |
| Operating wavelength range | 380-2000 nm (BK7) 250-2500 nm (UVFS) |
| Type | Reflective metal-coated (gradient thickness metal layer) |
| Calibration wavelength | 532 nm |
| Inner hole diameter | 8,0 mm |
| Inner hole diameter tolerance | +0,15/-0,00 mm |
| Outside diameter tolerance | +0,00/-0,15 mm |
| Thickness | 1,75 mm |
| Surface flatness | <λ@632,8 nm |
| Surface quality | 60-40 S-D |
| Clear aperture | >90% |
| Coated area | 0-270 deg |
| Parallelism | <3 arcmin |
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Substrate material
Outer diameter
Operating range
Optical density range
Average transmission in VIS
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PREIS
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BK7
Ø25 mm
380-2000 nm
0,04-1
90% to 10%
15676
165 €
BK7
Ø25 mm
380-2000 nm
0,04-2
90% to 1%
15677
165 €
BK7
Ø25 mm
380-2000 nm
0,04-3
90% to 0,1%
15678
165 €
BK7
Ø50 mm
380-2000 nm
0,04-1
90% to 10%
15679
210 €
BK7
Ø50 mm
380-2000 nm
0,04-2
90% to 1%
15680
210 €
BK7
Ø50 mm
380-2000 nm
0,04-3
90% to 0,1%
15681
210 €
BK7
Ø100 mm
380-2000 nm
0,04-1
90% to 10%
15682
285 €
BK7
Ø100 mm
380-2000 nm
0,04-2
90% to 1%
15683
285 €
BK7
Ø100 mm
380-2000 nm
0,04-3
90% to 0,1%
15684
285 €
UVFS
Ø25 mm
250-2500 nm
0,04-1
90% to 10%
15685
205 €
UVFS
Ø25 mm
250-2500 nm
0,04-2
90% to 1%
15686
205 €
UVFS
Ø25 mm
250-2500 nm
0,04-3
90% to 0,1%
15687
205 €
UVFS
Ø50 mm
250-2500 nm
0,04-1
90% to 10%
15688
250 €
UVFS
Ø50 mm
250-2500 nm
0,04-2
90% to 1%
15689
250 €
UVFS
Ø50 mm
250-2500 nm
0,04-3
90% to 0,1%
15690
250 €
UVFS
Ø100 mm
250-2500 nm
0,04-1
90% to 10%
15691
325 €
UVFS
Ø100 mm
250-2500 nm
0,04-2
90% to 1%
15692
325 €
UVFS
Ø100 mm
250-2500 nm
0,04-3
90% to 0,1%
15693
325 €
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