Wratten filter

Enjoy consistent performance and reliability. They are less sensitive to humidity, less prone to static cling.

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.

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.

This is according to that manufacturer's idea of how best to wratten filter a scene, and depending on the dyes and layering techniques used in manufacturing. Contact Us. Download Curve 99 Green.

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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.

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Color conversion, the opposite of the 80A; this is a warming filter that takes an outdoor scene lit by sunlight which has a color temperature around K and makes it appear to be lit by tungsten incandescent bulbs around K. Download Curve 32 Magenta. Download Curve - 92 Red. Toggle limited content width. Download Curve 12 Deep yellow. Download Curve 44A Light blue green. Contents move to sidebar hide. Download Curve 90 Dark grayish amber. Light blue-green. Cocktail Collection.

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Toggle limited content width. Custom Photos. Enjoy consistent performance and reliability. The opposite of 82A. Absorbs ultraviolet radiation, slightly less than No. Used for high-altitude photography. Article Talk. Absorbs more blue than 8. Longpass filter blocking visible wavelengths shorter than nm. Longpass filter blocking wavelengths shorter than nm. Mac Wallpaper. Download Curve 44 Light blue-green.