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filter

There are two types of filter in photography:(1) A photography filter is a transparent piece of tinted glass, plastic or gelatin, often but not necessarily disc-shaped, used to alter the color or character of light or to reduce the amount of light. Filters may be in the shape of discs, squares or rectangles. Filters are used in photography to change the appearance of a scene by emphasizing, eliminating or changing color or density, generally so that the scene can be recorded with a more natural look, on a particular film or a digital sensor.(2) In image-editing programs such as Adobe Photoshop, the use of a digital filter applies a set of image characteristics to all or part of an image.

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filter

A number that indicates to what extent you must increase exposure when you use a particular filter (by multiplying the unfiltered exposure by the filter factor number). Filters absorb light. The filter factor allows you to compensate for this absorption. The amount of exposure compensation has been predetermined for every filter, and is expressed as a filter factor (sometimes also called an exposure factor, and also referred to as Exposure Magnification or EM values).
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filter

is determined by the inner diameter of the front of a lens, more specifically the threads into which a filter is screwed to attach it to the lens. A 62 mm filter screws onto a lens that has threads that have a diameter of 62 mm. Most filters and some lenses are inscribed with their filter size in millimeters.
Photo Tips

filter

A colored piece of glass or other transparent material used over the lens to emphasize, eliminate, or change the color or density of the entire scene or certain areas within a scene.
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filter

A colored piece of glass or other transparent material used over the lens to emphasize, eliminate, or change the color or density of the entire scene or certain areas within a scene.
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filter

A colored piece ofglass or other transparent material used over the lens to emphasize, eliminate, orchange the color or density (ND) of the entire scene or certain areas within a scene.Also see colour temperature , UV . Technically, it explainedas a piece of material which restricts the transmission of radiation. Generally colouredto absorb light of certain colours. Can be used over light sources or over the cameralens. Camera lens filters are usually glass either dyed or sandwiching a piece ofgelatin in a screw-in filter holder.
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