{"id":"13843620-n","lexname":"noun.relation","members":[{"lemma":"focal ratio","sense":{"id":"focal_ratio%1:24:00::"},"poskey":"n"},{"lemma":"f number","sense":{"id":"f_number%1:24:00::"},"poskey":"n"},{"lemma":"stop number","sense":{"id":"stop_number%1:24:00::"},"poskey":"n"},{"lemma":"speed","sense":{"id":"speed%1:24:00::"},"poskey":"n"}],"definition":["the ratio of the focal length to the diameter of a (camera) lens system"],"ili":"i109535","partOfSpeech":"n","hypernym":["13841419-n"]}