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, but is arbitrary and does not encode any information the 80A—80D are blue, wratten filter, the next filters in numerical order, 81A—81EF, are orange ; letters almost always increase with increasing strength the exception being 2B, 2A, wratten filter, 2C, 2E. They are named for the founder of the first wratten filter company, British inventor Frederick Wratten. Wratten and partner C.

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.

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.

Download Curve 61 Deep green tricolor.

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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.

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.

Hockey-reference

Performs like 15, but more so. Greater over-correction of sky than No. Used for viewing scenes without color, before photographing them, in order to assess the brightness values. By removing much light that is not blue, blue and purple objects show a broader range of colors. Light yellow. Neutral density filter. Absorbs ultraviolet radiation, slightly more than 2A. Color densitometry Download Curve. Microscopy Primer. Mees sold their company to Eastman Kodak in , and Kodak started manufacturing Wratten filters. A compilation of bar charts for the common Kodak Wratten color filters are listed in Table 1. The transmission bands of filters are conveniently represented as a bar graph, such as the one illustrated in Figure 2.

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Can be used when shooting with type B film balanced for tungsten lighting K with K photoflood lights. Converts barrier-layer photocell response to eye luminosity response. Used for high-altitude photography. Enjoy consistent performance and reliability. Contrast filter for blue and blue-green absorption. Download Curve 12 Deep yellow. Download Curve 25 Red tricolor. Neutral Density No. Raises the scene's color temperature from K to approximately K , which allows use of daylight balanced film with tungsten lighting. White flame arc tri-color projection. Filter or Filter Combination. 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. Contrast filter, greater effect than Light Balancing Filters Enable minor adjustments in the color quality of illumination to obtain a cooler bluish or warmer yellowish color rendering.