Perhaps there's two things going on here--a transmission index showing the
amount of light that's really going throught the lens as measured by the TTL
meter, and the aperture, which may be just a mathematical calculation of the
size of the elements. I have some old Modern Photo tests and they do measure
the aperture.
18/3.5 f/3.51
28/2.8 AF f/2.89
50/1.2 f/1.26
50/1.4 f/1.44
100/2 f/2.05
180/2 f/2.01
Where does the lost light go? I have no idea but I guess into the internal
baffles and flocking eventually to be lost as heat I suppose.
And my Olympus lying to me? Never.
Warren
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