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Meaning : The ratio of the focal length to the diameter of a (camera) lens system.
Synonyms : focal ratio, speed, stop number
* किसी (कैमरे) लेंस तंत्र के व्यास की फोकस दूरी का अनुपात।
କୌଣସି (କ୍ୟାମେରା) ଲେନ୍ସ ତନ୍ତ୍ରର ବ୍ୟାସର ଫୋକସ ଦୂରତାର ଅନୁପାତ