film speed: meaning, definition, pronunciation and examples
C1technical, specialized
Quick answer
What does “film speed” mean?
A measure of a photographic film's sensitivity to light, expressed as an ISO number.
Audio
Pronunciation
Definition
Meaning and Definition
A measure of a photographic film's sensitivity to light, expressed as an ISO number.
In digital photography, the equivalent sensitivity setting (ISO) that mimics film's light sensitivity; more broadly, the rate at which photographic material reacts to light.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Both use 'film speed' for historical/analog contexts and 'ISO' for digital. Spelling: 'film speed' (both).
Connotations
In both varieties, the term carries technical, photographic connotations. In everyday speech, it's largely replaced by 'ISO setting' for digital cameras.
Frequency
More frequent in UK photographic publications preserving traditional terminology; in US, quicker adoption of 'ISO' alone.
Grammar
How to Use “film speed” in a Sentence
The film speed is [ISO number]Use [film speed] for [conditions][Subject] requires a [adjective] film speedVocabulary
Collocations
Examples
Examples of “film speed” in a Sentence
verb
British English
- You can push the film speed in development.
- They rated the film speed at 800.
American English
- You can boost the film speed if needed.
- They set the film speed to 1600.
adjective
British English
- The film-speed rating was clearly marked.
- A high film-speed stock was chosen.
American English
- The film-speed setting was too high.
- A low film-speed film is less grainy.
Usage
Meaning in Context
Business
In camera retail, discussing product specifications for film or digital sensors.
Academic
In photography theory, discussing the relationship between sensitivity, grain, and exposure.
Everyday
Rare in general conversation; used by photography enthusiasts discussing settings.
Technical
Precise measurement in photography, cinematography, and sensitometry.
Vocabulary
Synonyms of “film speed”
Vocabulary
Antonyms of “film speed”
Watch out
Common Mistakes When Using “film speed”
- Using 'film speed' to refer to shutter speed or frame rate.
- Saying 'film velocity' instead of 'film speed'.
- Confusing high film speed with fast shutter speed.
FAQ
Frequently Asked Questions
Yes, as a conceptual term. Digital cameras use 'ISO' settings which directly correspond to and are often explained by analogy to traditional film speed.
Film speed (ISO) is the sensitivity of the film/sensor to light. Shutter speed is the duration the shutter is open to expose the film/sensor to light.
To increase sensitivity, film uses larger silver halide crystals (grain), and digital sensors amplify the signal, which also amplifies random electronic noise.
It refers to the manufacturer's officially recommended film speed (ISO) for that specific film, as printed on the film's box.
A measure of a photographic film's sensitivity to light, expressed as an ISO number.
Film speed is usually technical, specialized in register.
Film speed: in British English it is pronounced /ˈfɪlm spiːd/, and in American English it is pronounced /ˈfɪlm spiːd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “Push the film speed (to rate it higher than box speed)”
- “Box speed (the manufacturer's rated film speed)”
Learning
Memory Aids
Mnemonic
FILM SPEED: Fast film needs less Light; Slow film needs more Light. Remember F=Fast/Less light, S=Slow/More light.
Conceptual Metaphor
SPEED IS SENSITIVITY (A faster film speed means quicker reaction to light, like a faster vehicle).
Practice
Quiz
What does a higher film speed number indicate?