A series of numbers printed on the aperture ring of a professional camera lens to indicate the size of the aperture. Typical f-stop
positions include: f/32, f/22, f/16, f/11, f/8, f/5.6, f/4, f/2.8, f/2, and f/1.4. Because the f-stop number is a fraction, the size of the aperture actually decreases as the f-stop number increases.
International Press Telecommunications Council. A system of industry standard metadata headers that include a variety of informational fields such as object, name, title, city, state, country
of origin, credits, subject category, image caption, keywords, and special instructions.