Wratten filter

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B-3 , which includes tabulations of spectral data at various wavelengths. A typical visible light absorption spectrum for one of these filters, the Wratten number 34a, is illustrated in Figure 1. In this figure, absorption diffuse density is plotted as a function of wavelength from to nanometers. The 34a filter has a strong absorption band at nanometers, in the ultraviolet region of the spectrum, and another centered at nanometers in the green-yellow transition region of the visible spectrum. This filter passes or transmits wavelengths whose diffuse density is less than 0.

Wratten filter

Wratten numbers are a labeling system for optical filters , usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information the 80A—80D are blue, the next filters in numerical order, 81A—81EF, are orange ; letters almost always increase with increasing strength the exception being 2B, 2A, 2C, 2E. They are named for the founder of the first photography company, British inventor Frederick Wratten. Wratten and partner C. Mees sold their company to Eastman Kodak in , and Kodak started manufacturing Wratten filters. They remain in production, and are sold under license through the Tiffen corporation. Wratten filters are often used in observational astronomy by amateur astronomers. For imaging interference filters are used. Wratten filters are also used in photomicrography. Filters made by various manufacturers may be identified by Wratten numbers but not precisely match the spectral definition for that number. This is especially true for filters used for aesthetic as opposed to technical reasons.

Labeling system for optical filters.

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Enjoy consistent performance and reliability. They are less sensitive to humidity, less prone to static cling. The new filters are easier to install and sort into optical components. Fingerprint removal is also easier. Choose with confidence. In your business, you depend on consistent, optimal performance.

Wratten filter

Wratten numbers are a labeling system for optical filters , usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information the 80A—80D are blue, the next filters in numerical order, 81A—81EF, are orange ; letters almost always increase with increasing strength the exception being 2B, 2A, 2C, 2E. They are named for the founder of the first photography company, British inventor Frederick Wratten. Wratten and partner C. Mees sold their company to Eastman Kodak in , and Kodak started manufacturing Wratten filters. They remain in production, and are sold under license through the Tiffen corporation. Wratten filters are often used in observational astronomy by amateur astronomers. For imaging interference filters are used. Wratten filters are also used in photomicrography.

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Cocktail Collection. Color conversion for photometry: Makes a barrier-level type photocell respond as a human eye would. Special Dye Color Filters Color filters that incorporate rare dye materials. Download Curve 34A Violet. In this figure, absorption diffuse density is plotted as a function of wavelength from to nanometers. Download Curve 12 Deep yellow. Blocks all frequencies of visible light approximately evenly, making scene darker overall. Microscopy Primer. Retrieved Minus-red filter with much UV absorption. The opposite of 82A. Red for 'two color photography' daylight or tungsten. Hidden categories: CS1 maint: multiple names: editors list Articles with short description Short description matches Wikidata Articles that may contain original research from July All articles that may contain original research Articles lacking reliable references from July All articles lacking reliable references All articles with unsourced statements Articles with unsourced statements from September Articles with unsourced statements from July

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Equivalent to No. Filming the Fantastic. Based on Wood's glass , transmits small bands of ultraviolet radiation and infrared radiation. Blue tricolor. Available in many different values, distinguished by optical density or by filter factor. Raises the scene's color temperature from K to approximately K , which allows use of daylight balanced film with tungsten lighting. Download as PDF Printable version. Wratten and partner C. Color Compensating Filters Control color by attenuating principally the red, green, or blue part of the spectrum. Labeling system for optical filters. Used for high-altitude photography, and in astronomy to mask achromatic lens color-fringing. Microscopy Primer. Not used for actual photography. Used to reduce the intensity of light by a definite ratio, without affecting the tonal rendition of colors. License Info.