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ASA and ISO describe the same practical film-speed number. ASA was the former American arithmetic scale; ISO is the international standard that replaced ASA and combined its arithmetic scale with the logarithmic DIN system. Thus, ASA 400 and ISO 400 call for the same normal exposure setting on a camera.
ASA and ISO at a glance
| Point of comparison | ASA | ISO |
|---|---|---|
| Issuing system | American Standards Association (United States) | International Organization for Standardization |
| Historical status | Older photographic film-speed terminology | Current international terminology that superseded ASA |
| Numbering | Arithmetic scale, such as ASA 100 or ASA 400 | Arithmetic speed number; formal notation could also include a DIN value, such as ISO 50/18° |
| Practical exposure meaning | Higher number means more sensitivity and less light needed | Same arithmetic meaning: higher number means more sensitivity and less light needed |
In everyday photography, the arithmetic number is effectively continuous between the two labels. A film marked ASA 100 corresponds to ISO 100, and ASA 400 corresponds to ISO 400.
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What does ASA mean?
ASA stands for the American Standards Association, the United States standards body whose photographic speed system was widely used on film boxes and camera dials. ANSI’s institutional history identifies ASA as the predecessor organization that later became the American National Standards Institute; ISO’s explainer dates the organization’s name change to 1969. See the ANSI history timeline.
ASA ratings use an arithmetic, or linear, scale. Doubling the number indicates film that needs about half as much light for a comparable exposure: ASA 200 is one stop faster than ASA 100, and ASA 400 is one stop faster than ASA 200.
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What does ISO mean?
ISO is the international film-speed standard. The International Organization for Standardization explains that ASA was superseded by ISO standards including ISO 6, ISO 2240 and ISO 5800, while the linear scale ASA established remained in use.
Historically, ISO notation could show both the arithmetic value and the DIN logarithmic value. A package might therefore say ISO 50/18°: “50” is the arithmetic speed familiar to most photographers, while “18°” is the corresponding DIN value. Modern packaging and camera controls generally emphasize only the arithmetic ISO number.
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What does ASA 400 (or ISO 400) mean?
ASA 400 means the film is relatively sensitive to light. Compared with ASA 100, it can produce a similar exposure with roughly one-quarter of the light (a two-stop difference). That makes ISO/ASA 400 useful indoors, in shade, at dusk, or when a faster shutter speed is needed to reduce subject movement.
Higher speed is not automatically better. Faster films generally show more visible grain and can produce less clean-looking images than slower films when both are used in sufficient light. ISO 100 or 50 is often preferred for bright scenes and maximum fine detail; ISO 400 or higher is useful when light is limited or the subject is moving. ISO summarizes the film’s sensitivity, not the image’s artistic quality.
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Can you use ISO film in an old ASA camera?
Usually, yes. Set the camera’s ASA dial or selector to the same number printed as the film’s ISO rating. For example, load ISO 400 film and set an older camera marked ASA to 400. The terminology changed when the international standard replaced the older ASA/DIN wording; the useful arithmetic speed number did not.
Checks before shooting
- Confirm that the film’s printed speed is the speed your camera can set. If the dial has no exact value, use the nearest available setting and meter accordingly.
- Check whether the camera’s meter is working and whether its light-meter range suits the film and lighting.
- For a vintage camera with a manual meter, set the film speed yourself; an automatic camera may read a coded cartridge instead, depending on its design.
- Do not change the camera’s setting partway through a roll unless you intentionally plan to push or pull process the film and tell the lab.
How to convert ASA to ISO
For ordinary film-speed selection, conversion is direct:
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- Read the ASA number on the camera or older film documentation.
- Use the same numeric value as ISO on a modern camera, meter or film package.
- Example: ASA 100 = ISO 100; ASA 400 = ISO 400.
This is a terminology conversion, not a mathematical recalculation. The historical ISO form may add a DIN degree value, but that does not change the arithmetic setting used by most cameras.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which standards define film speed today?
Different standards cover different film categories. ISO 5800:1987 covers colour-negative films for still photography; ISO’s record identifies it as published in November 1987 and confirmed current in 2026. ISO 6:1993 covers black-and-white pictorial still-camera negative film and process systems. These standards specify how speed is determined; the ISO number on a package is the practical result photographers use for exposure.
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ASA versus ISO: the useful takeaway
ASA is the older American name, while ISO is the international successor. For selecting film and setting a camera, treat matching arithmetic numbers as equivalent. Choose a lower number when abundant light and fine grain matter most; choose a higher number when you need to work in dimmer light or use faster shutter speeds.
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