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Film speed is the measure of a photographic film's sensitivity to light. Film with lower sensitivity (lower ISO speed) requires a longer exposure and is thus called a slow film, while stock with higher sensitivity (higher ISO speed) can shoot the same scene with a shorter exposure and is called a fast film.

In the first approximation the amount of light energy which reaches the film determines the effect on the emulsion, so that if the brightness of the light is multiplied by a factor and the exposure of the film decreased by the same factor so that the energy received is the same, the film will be exposed to the same density; this rule is called reciprocity, and the concept of a unique speed for an emulsion is possible because reciprocity holds. In practice this holds reasonably well for normal photographic films for the range of exposures usually used, say 1/1000 sec to 1 sec, but longer exposures, different for different films, are required outside these limits, a phenomenon known as reciprocity failure.

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Top websites

Film speed - Wikipedia, the free encyclopedia
Film with lower sensitivity (lower ISO speed) requires a longer exposure and is thus called a slow film, while stock with higher sensitivity (higher ISO speed) ...

Film Speed
... and the film you use, it's a good idea to know which film speed will work in ... On the contrary, low-numbered film speed is less sensitive to light and needs ...

Speed Racer (film) - Wikipedia, the free encyclopedia
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Silent Film Speed
... "silent speed" grow quite heated over the projection of any silent film on a ... legendary "silent speed" of 16 frames per second which drags the film along at ...

Film Speed - SimCam - Film and Digital Camera Simulator - Photonhead.com
Sometimes using a faster film speed is the only way to get a sharp image. ... SimCam Film Speed Example: First set both SimCams to 1/60 f/4 and shoot a picture. ...

Film Speed
Film Speed Basics ... Speed is how fast a film can capture an image when exposed to a minimal amount of light. ... so that we can compare films with each other. ...

film speed: Definition and Much More from Answers.com
film speed Indication of the amount of light needed to maximize the reproduction ... Film speed is expressed as an ISO number, which refers to an internationally ...

ASA, ISO, DIN
... have been many attempts to classify "film speed", even though there is no single ... all of the various speed rating systems for film, three may still be ...

Determining Film Speed
Your individual film "speed" may also be affected by ... surface using your best estimate (or manufacturer's rating) of the film speed. ...

Film Speed
An explanation of film speed ... About>Hobbies & Games>Photography> Taking Pictures> Glossary> Film Speed. Photography ... Occasionally film speed is still ...

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Re: The 45 Questions That Frighten LNT'ers - One by One (#1)

... goat skin placed over the target area. Figure A5, part B, shows the camera and lights used to record the sequence of events at a film speed of 4,000 frames/ sec. The gunner was positioned 90 yd from the skulls, this being the approximate distance from the assassin to the President along ...

Re: The 45 Questions That Frighten LNT'ers - One by One (#1)

... unclipped goat skin placed over the target area. Figure A5, part B, shows the camera and lights used to record the sequence of events at a film speed of 4,000 frames/ sec. The gunner was positioned 90 yd from the skulls, this being the approximate distance from the assassin to the President along ...

Re: The 45 Questions That Frighten LNT'ers - One by One (#1)

... of unclipped goat skin placed over the target area. Figure A5, part B, shows the camera and lights used to record the sequence of events at a film speed of 4,000 frames/ sec. The gunner was positioned 90 yd from the skulls, this being the approximate distance from the assassin to the President along the ...

Re: Time to stop flying?

...seriously considering either going back to film, which would be a pain,... a pain to get the films processed... I just wonder if ... Pentax K10, I find the "film" speed programme very useful with ... better than my old manual film cameras lens ring. the viewfinder ... got rid of my old film SLR (A Pentax K1000) years ... the new Voigtlander rangefinders but film seems such a dreadful step ...

Re: Time to stop flying?

...m seriously considering either going back to film, which would be a pain, or ...would be a pain to get the films processed... I just wonder if I ... use Pentax K10, I find the "film" speed programme very useful with a telephoto (you set aperture and shutter, the camera sets the film speed) when i'm not using ... much better than my old manual film cameras lens ring. the viewfinder display ...

FS: Cobra 35 mm Waterproof Camera with Film - via auction

...Cobra 35 mm Waterproof Camera with Film . Auction Start : 2008-03-29 21....0 28mm lens Focusing Fixed Focus Film Speed ISO 100-400 Film Winding Manual Viewfinder Optical- Reverse Galilean Type ... construction safe to 10 feet Film Reloadable Camera can be Re-... and used again Pre-Loaded Film Camera loaded with high quality ... Waterproof Case Wrist Strap Manual Film . All Details available at : http://...

FS: Cobra 35 mm Waterproof Camera with Film - via auction