> I could not get the calculator to come up with a magnification of
> 0.20 for 400mm, unless closest working distance was 2.4m This is
> clearly not the case since the lens can focus down to less than 2m.
>
> The only way to calculate a magnification of 0.20 at the closest
> working distance is if the focal length is between 233 and 300mm !!!
>
This is probably the case! Most rear or internal focussing lenses reduce their
focal length significantly when at closest focus.
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