Is there a way to know the maximum apertures throughout all focal distances?

Started 11 months ago | Discussions thread
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starlight110
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Is there a way to know the maximum apertures throughout all focal distances?
11 months ago

I´m comparing some canon cameras deciding which one to buy and I can´t find this basic and for me very important information, they only state the max apertures in wide and tele, like f/3,4 w, f/6,4 t for the sx50, but I want to know the max apertures in "all focal distances" not only extremes, for instance, from 200mm to 400mm f/4,5 and so on, is there a formula or mathematical way to know this with the information available?? or I have to buy each camera to try them and get this information??

Thanks for the answers

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