Wratten filter

Wratten numbers are a labeling system for optical filtersusually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, wratten 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 wratten filter, British inventor Frederick Wratten, wratten filter.

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

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. The transmission bands of filters are conveniently represented as a bar graph, such as the one illustrated in Figure 2. The darker areas represent regions of transmission by a filter that exceed 10 percent, and the lighter areas represent wavelengths blocked by the filter. This type of graph provides a simple index for comparing a set of filters to quickly determine the suitable filter for any particular application. A compilation of bar charts for the common Kodak Wratten color filters are listed in Table 1. Mortimer Abramowitz - Olympus America, Inc. Michael W. Microscopy Primer. Light and Color.

Not used for actual photography.

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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. They offer uniform thickness and excellent optical quality, assuring product is functionally the same among batches. Control color by attenuating principally the red, green, or blue part of the spectrum. Can be used to make changes in the color balance of images recorded on color films, or compensate for deficiencies in the spectral quality of a light source.

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.

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They offer uniform thickness and excellent optical quality, assuring product is functionally the same among batches. Download Curve 47A Light blue. Michael W. Deep orange. In black and white outdoor photography makes blue skies look very dark, almost black. Download Curve 90 Dark grayish amber. Download Curve 26 Red. Red tricolor. Light blue. Absorbs more blue than 8. Article Talk. This article possibly contains original research. Used to block visible light from UV lamps. Read Edit View history.

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A typical visible light absorption spectrum for one of these filters, the Wratten number 34a, is illustrated in Figure 1. Color separation and tricolor printing. Contrast filter for blue and blue-green absorption. Enjoy consistent performance and reliability. Longpass filter blocking visible wavelengths shorter than about nm. Absorbs more ultraviolet radiation than No. Download Curve 15 Deep yellow. Categories : Photography equipment Optical filters Encodings. In infrared photography, blocks much visible light, increasing the effect of the infrared frequencies on the picture. Color conversion for photometry: Makes a barrier-level type photocell respond as a human eye would. Used for color separation, complements 47 and Web Resources.