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I completely understand that the focal length of the lens doesn't change, I'm just trying to explain the maths so that someone can work out what lens they might want. If you are used to photography with the nifty fifty on a 35mm and you are wondering what lens on a 1.6 crop camera you would need to use to get the same field of view (or angle of view) then you can use the math example provided to calculate what you need.
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