Filter factor 2
The number by which an unfiltered exposure reading must be multiplied to give the same effective exposure through the filter. This compensates for the absorption of light by the filter.
Filter factor
Indicates the amount the unfiltered exposure should be increased when an optical filter is attached.
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Filter factor
Techniques Glossary Filter factor
Indicates the amount the unfiltered exposure should be increased when an optical filter is attached.
FILTER FACTOR - 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.
Filter Factor - This is the amount of light the filter blocks out.
Filters - Can be plastic or glass attachments for the lens of the cameras. The effect the filter achieves differs depending on the filter used.
filter factor
a number by which the exposure time is multiplied to compensate for light lost when light passes through a color filter on a camera lens.
Filter Factor
The Exposure correction needed to compensate for light losses due to a filter. Through-the-Lens Meter-ing automatically compensates for most filters.
Filter factor
The increased exposure needed to compensate for the amount of light absorbed by a filter.
-Filter Factor Equivalent Exposure Table Example: The unfiltered exposure calls for l/60 second, and the filter factor is 3. The correct exposure is 1/20 second (1/60 x 3 = 1/20 second).
Color Filter Absorption - Absorption curves for some typical color filters
Filter Factors - Exposure adjustment for B&W photography
Light Source Color Temperatures - Color temperatures for some common light sources
Masking Spectrum ...
neutral density filter. Blocks all frequencies of light evenly, making scene darker overall. Available in many different values, distinguished by optical density or by filter factor.
98
blue
Like a #47B plus a #2B filter.
99
green ...
In use on the camera, using such filters is pretty straightforward. Screw the filter onto the lens or slip it into the holder and shoot away. The filter factor is automatically accounted for by the camera’ ...
Then there's B+W and Hoya who prefer calling the same thing 2x, 4x, and 8x (known as the filter factor). In addition to these, I also have a B+W 64x which translates to a full 6 stops of neutral density. This is the ticket to great waterfall photos.
Because these filters block part of the light, exposures are increased by between 2 and 3 stops—referred to as the filter factor.
Skylight filters reduce the blue casts you often get when photographing subjects in the shade on sunny days.
You need to make manual exposure adjustments depending on the filter factor to get proper exposure. Polarizers used with wide-angle lenses can cause Vigenetting. Avoid thick filters if you are buying a new polarizers.
 See also: Factor, Filter, Photograph, Exposure, Light
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