Tuesday 29 January 2019

zoom - How to get focal length from a camera specification which gives a value like "4.5-22.5"?


I am using a Sony W520 camera. The specifications mention Focal Length (f= mm) 4.5-22.5. What number should I take? The lower value or the higher? And if not both of them, then how to calculate actual focal length without knowing distance?




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