Film speed
Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital imaging systems.
Relatively insensitive film, with a correspondingly lower speed index, requires more exposure to light to produce the same image density as a more sensitive film, and is thus commonly termed a slow film. Highly sensitive films are correspondingly termed fast films. In both digital and film photography, the reduction of exposure corresponding to use of higher sensitivities generally leads to reduced image quality (via coarser film grain or higher image noise of other types). In short, the higher the sensitivity, the grainier the image will be. Ultimately sensitivity is limited by the quantum efficiency of the film or sensor.
Film speed measurement systems
Historical systems
Warnerke
The first known practical sensitometer, which allowed measurements of the speed of photographic materials, was invented by the Polish engineer Leon Warnerke – pseudonym of Władysław Małachowski (1837–1900) – in 1880, among the achievements for which he was awarded the Progress Medal of the Photographic Society of Great Britain in 1882. It was commercialized since 1881.
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Eyez
by: P.O.D.When it all goes down we will rise! [x5]
But you ain't seen nothing yet!
One vision, death has risen
To meet his majesty. The blasphemy is unforgiven
And through this alchemy of calvary, only one decision
I and I prophecy the truth and destroy the wicked
Millennial reign, surrender to the guillotine
Last breath, second death, sentenced to a murder scene
So when I'm gone, don't you act surprised
It's going down right in front of your eyes
When it all goes down we will rise!
But you ain't seen nothing yet! (Eyez)
This world!(Eyez) Your life!(Eyez)
But you ain't seen nothing yet!(Eyez)
Awake and scream all who sleep in the earth
Hear his voice in the grave, arise and step forth
And make your stand while men run for the hills
Fill the valley with blood and flood the killing fields
Keep laughing now, you're gonna regret it then
'Cause this day God will judge all the secrets of men
Mark my words and don't act surprised
It's going down right in front of you eyes
When it all goes down we will rise!
But you ain't seen nothing yet!(Eyez)
This world!(Eyez) Your life!(Eyez)
But you ain't seen nothing yet!(Eyez)
This will be the last time you will see me again
This will be the last time you ever see me again
One man is guilty and one man is not
And you will answer for yourself whether you like it or
not!
One man lives and the other man dies
It's going down right in front of your eyes
When it all goes down we will rise!
But you ain't seen nothing yet!(Eyez)
This world!(Eyez) Your life!(Eyez)
But you ain't seen nothing yet!
But you ain't seen nothing yet!
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