I heard the Zuiko 50/2 do get shorter in focal length at close focus.
C.H.Ling
Julian Davies wrote:
>
> >> By definition, a lens's focal length is the distance from the lens's
> optical center to the film plane.
>
> At infinity focus
>
> >>As you focus closer, the lens's focal
> length increases.
>
> NOPE only "internal focusing" lenses change focal length with focus action.
> They get shorter as you focus closer. External focus lenses (all Zuikos
> except the white ones , the 18 and 24 shift) do not change their focal
> length.
>
> Julian
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