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50mm Diameter Mounted 0.04-3.0 OD, Circular Variable Neutral Density (ND) Filter

Mounted Circular Variable Neutral Density (ND) Filters

Stock #54-536 3-4 days
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Angle of Incidence (°):
Optical Density OD (Average):
0.04 - 3.0
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Inner Diameter (mm):
Outer Diameter (mm):
Surface Quality:
Thickness (mm):
Thickness Tolerance (mm):
Neutral Density Filter
Blocking Wavelength Range (nm):
400 - 700
Parallelism (arcmin):
Dimensional Tolerance (mm):
±0.10 ID, ±0.20 OD
Optical Density Tolerance (%):
Linearity (%):
Coating Specification:
Continuously Variable Inconel from 0 - 270°

Regulatory Compliance

Certificate of Conformance:

Product Family Description

  • Continuously Variable Over 270°
  • Spectrally Flat from 400-700nm
  • Mounted and Unmounted Versions Available

Circular Variable Neutral Density (ND) Filters are continuously variable over 270° of the filter. These filters provide linear attenuation of incident light by rotating the filter. Designed to be spectrally flat from 400 to 700nm, they provide excellent attenuation for spectrometers and other optical instruments. Circular Variable Neutral Density (ND) Filters, with a durable anodized aluminum mount, have an indicator arrow that accurately identifies the angular position of the filter for increased repeatability. The 50mm OD filters are available mounted or unmounted. The 360° rotating mount comes complete with a 4" Length, 0.5" Diameter stainless steel post. 

Technical Information

Optical Density
  25.4mm Outer Diameter (OD)
7.5mm Inner Diameter (ID)
50.0mm Outer Diameter (OD)
7.5mm Inner Diameter (ID)
100.0mm Outer Diameter (OD)
25.4mm Inner Diameter (ID)
50.0mm Outer Diameter (OD)
7.5mm Inner Diameter (ID)
0.04-1.0 #43-759 #43-763 #43-767 #54-534
0.04-2.0 #43-760 #43-764 #43-768 #54-535
0.04-3.0 #43-761 #43-765 #43-769 #54-536
0.04-4.0 #43-762 #43-766 #43-770 #54-537