Discussion
Which of the following black-and-white film is considered as slow film ?
Answer: D
The slow film is ISO 25/15–50/80, the paper's misprint for ISO 25/15° to 50/18°.
A film's ISO speed measures its sensitivity to light, and each rating is given in two forms, an arithmetic number (25, 100, 400) and a logarithmic degree value (15°, 21°, 27°). Slow films, ISO 25 to 50, need more light but give fine grain and high resolution, which suits copying documents and close-up evidence photography.
ISO 100 to 200 is medium speed, while ISO 400 to 500 and ISO 800 to 3200 are fast films for low light, with coarser grain.
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