2.5 OD 50mm Sq, Absorptive ND Filter

Product Details Attenuates Visible Light Via Absorption, Rather than Reflection Multiple Filters Can be Stacked for Increased Blocking Optical Densities from 0.1 to 4.0 are Available Also Available Pre-mounted in C-Mount Housings Hoya Absorptive Neutral Density (ND) Filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, the neutrality and density of absorptive filters are a function of the material and the thickness. Hoya neutral density filters are held to a specific thickness, meaning that optical density is dependent on glass type. Useful application spaces include measuring instruments and exposure control in imaging. Optical Density exhibits an additive relationship; for example, stacking filters with OD values of 0.6 and 0.9 yields a resultant density of 1.5. The optical density is related to the transmission by the following equation: T = 10^-OD x 100 = percent transmission. Note: Due to supply chain issues, our kits may be delivered with an alternative packaging solution in place of a wooden box. For any questions, please contact [email protected] . Filter Simulation Software Click here to download HOYA’s colored glass filter simulation software which can be used to calculate the internal transmittance and external transmission of each HOYA glass type. The software can simulate the performance of individual filters with user specified thickness. Absorptive Neutral Density Filter Kits #55-222 includes 6 filters in optical density values of 0.15, 0.3, 0.4, 0.6, 0.9 and 2.5. #63-468 , #63-469 , #63-470 and #66-155 each include 14 filters in optical density values of 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1.0, 1.3, 1.5, 2.0 and 2.5. Please note that OD 3.0 is the only one not included in these kits. Specifications General Type of Filter: Absorptive ND Filter Type: Neutral Density Filter Physical & Mechanical Properties Dimensions (mm): 50.0 x 50.0 Length (mm): 50.00 Thickness (mm): 2.50 ±0.5 Width (mm): 50.00 Dimensional Tolerance (mm): ±0.2 Parallelism (mm): <0.02 Optical Properties Optical Density OD (Average): 2.5 ±0.1 Glass/Filter Number: Hoya ND0.3 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More ND Filter Glass Coating: Uncoated Index of Refraction (n d ): 1.51 Surface Quality: 80-50 Transmission (%): 0.3 (average) Blocking Wavelength Range (nm): 400 - 700 Material Properties Transformation Temperature (°C): 490 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 247: Compliant ×