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Senior sales engineer
Arminas Butkus +370 5 219 4884
Circular variable neutral density filters
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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
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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. Using two filters in combination in reverse rotation can obtain a fixed density attenuation and extends the number of applications. Sizes are available from 25 mm to 100 mm in diameter.

Circular variable neutral density filters
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
Order your item
Substrate material Outer diameter Operating range Optical density range Average transmission in VIS SKU PRICE QUANTITY
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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