4/3 is definitely the dimensions, they try to setup a standard for the
image circle size and lens mount so that the lenses can be shared.
Actually most compact DCs are 4:3 except the Nikon and Canon DSLR
which designed for their 35mm system.
C.H.Ling
Chris Barker wrote:
>
> I thought that the 4/3 related to the proportions, rather than
> absolute dimensions: 4:3 ratio. It was reported as such in the
> latest Amateur Photographer.
>
> Chris
> >
> >Why should it be any harder, though, to do a 12mm focal length lens with a
> >4/3" image circle than a 16mm focal length with a 1.8 inch image circle?
> >Some very respected names in lensmaking have been building optics for
> >smaller formats for years with nice wide angles of view, as well as larger
> >formats with longer focal lengths - a 38mm lens for 6x6 is no piece of cake
> >either. In all three cases, flange-to-film distance is the same obstacle:
> >that 16mm Zuiko is considerably more than 16mm from the film plane.
> >
>
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