Kurt just posted a finding that the 90mm f/2 Zuiko Macro transmits less light
than a 100mm f/2 Zuiko. I just thought I'd caution the engineer-types that
the close-focus aberration correction in certain Zuiko lenses will change the
effective focal length when close focused. Internal focusing does the same
thing. For example, the 50mm f/2 Zuiko is actually 40mm at 1:2 magnification.
Thus T/stop calculations ought to include this factor to be precise.
Gary Reese
Las Vegas, NV
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