f number

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Shopping	The largest selection of F NUMBER products: USA, UK, Canada, Deutschland, France.
TV Shop	As seen on TV: beauty, diets, exercise, household, kitchen, personal, vitamins, and other popular TV-products.

f number > noun, relation
Meaning	The ratio of the focal length to the diameter of a (camera) lens system.
Synonyms	focal ratio, stop number, speed
Broader	ratio