[OM] Focal Length Shift Due to Floating Elements?

[ALEXSCIFI]

Someone posted an email recently that stated the 50F2.0 Zuiko macro had a
focal length of 40mm at it's closest focusing point, as opposed to 50mm at
infinity. Does anyone know what the focal length at closest focusing point is
for the following Olympus lenses:

          *   85F2.0

         *    90F2.0

         *    100F2.0

         *     28F2.0

Thanks

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