Help with UV Filters specifications:
Filter Type
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| Bandpass / Interference Filters | Optical bandpass filters are designed to transmit a specific waveband. They are composed of many thin layers of dielectric materials that have differing refractive indices to produce constructive and destructive interference in the transmitted light. | ||
| Cold Mirrors | Cold mirrors are heat transmitting mirrors / filters designed to reflect visible wavelengths while transmitting near-infrared wavelengths. | ||
| Color Filters | Color filters include a wide range of filter types that are distinguished by their specific color spectrums and wavelengths, as well as their Schott glass compositions. | ||
| Dichroic Filters | Dichroic filters are accurate color filters used to pass select wavelengths of light while reflecting all other colors and wavelengths. Dichroic mirrors are used to reflect desired colors or wavelengths. | ||
| Hot Mirrors | Hot mirrors are heat reflecting mirrors / filters designed to transmit visible wavelengths while reflecting near-infrared heat generating wavelengths. | ||
| Long Pass Filters | Long pass filters transmit a wide spectral band of long wavelength radiation while blocking short wavelength radiation. | ||
| Neutral Density Filters | Neutral density filters are designed to reduce transmission evenly across a portion of the spectrum. They are slightly sensitive to angles, but are much more forgiving than interference filters. | ||
| Short Pass Filters | Short pass filters transmit a wide spectral band of short wavelength radiation and block long wave radiation. | ||
| Spectral Filters | Spectral filters are used to selectively transmit light according to its wavelength. They are not to be mistaken with color filters, which can be differentiated by an associated Schott glass number. | ||
| Other | Other unlisted, specialty or proprietary filter type. | ||
| 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
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| 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. | ||
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| 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. | ||
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| 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. | ||
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| 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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Wavelength Range
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| Transmission Range: | The area of the spectrum where the filter transmits. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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| Rejection Range: | The area of the spectrum where the filter does not transmit. | ||
| Search Logic: | User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria. | ||
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Substrate Material
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| 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
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| 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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