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  • Substrate: UV Fused Silica
  • Spectral Range: 380-1200nm
  • Surface Quality: 60-40 Scratch-Dig
  • Wedge: <3 arcmin
  • Irregularity (per cm2): <λ
  • Optical Density Tolerance: +/-5% (each extreme)

    For Quantity Discounts, OEM and Custom Orders, please contact us directly.

Our continuously variable filters have an ND coating on the front with no coating on the back. They are coated through a full 270° and provide linear, adjustable attenuation by rotation. The Optical Density (OD) is defined as follows:

D = log10(1/T), or T = 10-D
 
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SorryAnerroroccurredwhenyourequestedthispage.Theerrorhasbeenloggedandwewillworktocorrecttheproblem.Weapologizefortheinconvenience.Pleaseemailwebmaster@thorlabs.comifyoureceievedthispagebyaccident.ReturntoThorlabsHomepage
PART NUMBER PRODUCT TITLE
ThorLabs-Error
>FNC-25C-2		 Circular Variable ND Filter, 25mm, OD Range 0-2.0
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>FNC-25C-4
 Circular Variable ND Filter, 25mm, OD Range 0-4.0
ThorLabs-Error
>FNC-50C-2		 Circular Variable ND Filter, 50mm, OD Range 0-2.0
ThorLabs-Error
>FNC-50C-4		 Circular Variable ND Filter, 50mm, OD Range 0-4.0
ThorLabs-Error
>FNC-76C-2 Circular Variable ND Filter, 76.2mm, OD Range 0-2.0 ThorLabs-ErrorSorryAnerroroccurredwhenyourequestedthispage.Theerrorhasbeenloggedandwewillworktocorrecttheproblem.Weapologizefortheinconvenience.Pleaseemailwebmaster@thorlabs.comifyoureceievedthispagebyaccident.ReturntoThorlabsHomepage>FNC-76C-4 Circular Variable ND Filter, 76.2mm, OD Range 0-4.0 ThorLabs-ErrorSorryAnerroroccurredwhenyourequestedthispage.Theerrorhasbeenloggedandwewillworktocorrecttheproblem.Weapologizefortheinconvenience.Pleaseemailwebmaster@thorlabs.comifyoureceievedthispagebyaccident.ReturntoThorlabsHomepage>FNC-100C-2 Circular Variable ND Filter, 100mm, OD Range 0-2.0 ThorLabs-ErrorSorryAnerroroccurredwhenyourequestedthispage.Theerrorhasbeenloggedandwewillworktocorrecttheproblem.Weapologizefortheinconvenience.Pleaseemailwebmaster@thorlabs.comifyoureceievedthispagebyaccident.ReturntoThorlabsHomepage>FNC-100C-4 Circular Variable ND Filter, 100mm, OD Range 0-4.0
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