25.4mm Diameter Unmounted 0.04-2.0 OD, Circular Variable Neutral Density (ND) Filter

Product Details 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. Specifications General Type of Filter: Variable ND Filter Type: Neutral Density Filter Linearity (%): ±5 Physical & Mechanical Properties Inner Diameter (mm): 7.5 Outer Diameter (mm): 25.4 Thickness (mm): 1.52 ±0.25 Parallelism (arcmin): ±3 Dimensional Tolerance (mm): ±0.10 ID, ±0.20 OD Optical Properties Angle of Incidence (°): 0.00 Optical Density OD (Average): 0.04 – 2.0 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More B270 Coating: Variable Surface Quality: 60-40 Blocking Wavelength Range (nm): 400 – 700 Optical Density Tolerance (%): ±5 Coating Specification: Continuously Variable Inconel from 0 – 270° Threading & Mounting Mount: Unmounted Regulatory Compliance Reach 181: Compliant × RoHS 2015: Compliant × Certificate of Conformance: View ×