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Neutral Density Filter Type:

Filter Shape:

Diameter, Square Side, or Rectangular Length:

Rectangular Width:

Thickness:

Optical Density:

Transmission (%):

(%)

Substrate Material:

Filter Surface Quality:

Help with Neutral Density Filters specifications:

Neutral Density Filter Type
   Neutral Density Filter Type      Neutral density filters reduce transmission either by reflection or absorption. Variable neutral density filters change the transmission linearly over time.
   Your choices are...         
   Reflective       The filter uses partial reflection to reduce the transmission evenly. 
   Absorptive       The filter uses partial absorption to reduce the transmission evenly. 
   Variable       The filter uses a linearly changing filter to change the transmission evenly over time. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Filter Geometry
   Filter Shape:      Filters can either come round, square, or rectangular.
   Your choices are...         
   Circular       The filter is circular. 
   Square       The filter is square-shaped. 
   Rectangular       The filter is rectangle-shaped. 
   Other       Other unlisted, specialty, or proprietary filter shape. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Diameter, Square Side, or Rectangular Length:       If the filter is circular, the diameter. If the filter is square, the length of a side. If the filter is rectangular, the length of its largest side. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Rectangular Width:       If the filter is rectangular, the length of its shorter side. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Thickness:       The thickness of the filter. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Optical Density
   Optical Density:       Optical density is defined as the logarithm to the base ten of the ratio of the power of the incident beam to that of the exiting beam. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Transmission (%)
   Transmission (%):       As a beam of light passes through an absorbing medium, the amount of light absorbed is proportional to the intensity of incident light times absorption coefficient. Consequently the intensity of an incident beam drops exponentially as it passes through the absorber. The transmitted intensity, divided by the incident intensity, times 100, is the transmission %. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Substrate Material
          It is the optical properties of the material that determine the functionality of the filter.
   Your choices are...         
   BK7 Glass       BK7 is boro-crown glass (borosilicate glass). 
   Optical Crown Glass       Optical crown glass is one of the two principal types of optical glass, the other being flint glass. Crown glass is harder than flint glass and has a lower index of refraction and lower dispersion. 
   UV grade Fused Silica       UV grade fused silica offers improved transmission in the ultraviolet region compared with crown glass. 
   Fused Silica       Glass consisting of almost pure silicon dioxide (SiO2) and may also be called vitreous silica. Fused silica is frequently used in optical filters and windows. 
   Germanium       Germanium is a crystalline semiconductor material that transmits in the infrared. 
   Sapphire       Sapphire has a very broad transmission range extending from 150 nm to 6000nm. It has great hardness and resistance to chemical attack and thermal shock allows it to be used in environments where other less-costly components would not be suitable. 
   Soda Lime Glass       Soda lime glass is a formed with the addition of sodium or calcium oxides to silica-based glass. Sodium and calcium oxides are network modifiers, which generally reduce the melting point and melt viscosity, while reducing strength and chemical resistance.  
   Zinc Selenide       Zinc selenide exhibits excellent transmission from .69μm to 18μm. 
   Other       Other unlisted, specialty, or proprietary filter substrate material. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Filter Surface Quality
          Surface quality of the filter glass.
   Your choices are...         
   10-5 Scratch / Dig       A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 10 / 5 indicates the average diameter of the digs to be .05 mm and the average length of a scratch is .10 mm. 
   20-10 Scratch / Dig       A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 20 / 10 indicates the average diameter of the digs to be .10 mm and the average length of a scratch is .20 mm. 
   40-20 Scratch / Dig       A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 40 / 20 indicates the average diameter of the digs to be .20 mm and the average length of a scratch is .40 mm. 
   60-40 Scratch / Dig       A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 60 / 40 indicates the average diameter of the digs to be .40 mm and the average length of a scratch is .60 mm. 
   80-50 Scratch / Dig       A dig is a defect on a polished optical surface that is nearly equal in terms of its length and width. A scratch is a defect on a polished optical surface whose length is many times its width. 80 / 50 indicates the average diameter of the digs to be .50 mm and the average length of a scratch is .80 mm. 
   Other       Any other scratch / dig surface quality rating. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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