ASA Speed: Light sensitivity of film expressed in mathematical values. Equivalent to ISO (International Standards Organization) film speed ranges. The higher the number, the more sensitive the film is to light.
The international standard for rating film speed is the ISO scale which combines both the ASA speed and the DIN speed in the format ASA/DIN. Using ISO convention film with an ASA speed of 400 would be labeled 400/27°.
I also experimented with over-rating the ASA speed up to 1200 on Hi-speed Ectachrome and that put me in the position to take wonderful Aurora picks.
Generally, the lower the ISO number, the finer grained and slower a film. ISO means International Standards Organization. This term replaces the old ASA speed indicator. The slower the film, the more light is needed to expose it.
Change o-rings frequently, store and travel with your camera with them off. Flying with cameras sealed up can cause o-rings to burst out, not the main ones, but the smaller ones used to seal film winders and ASA speed adjusters.
includes national standards bodies from 156 countries. The American National Standards Institute (ANSI) is the U.S. representative. ANSI replaced the American Standards Association (ASA) in the 1970s, for those of you who remember the old ASA speeds.
If the film has another speed than the ASA speed on which the official guide number is based this guide number must be recalculated for the other film speed.
 See also: Image, ASA, Film, Camera, Exposure
  
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