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[OM] Dude - Who stole my 0.56ms?

Subject: [OM] Dude - Who stole my 0.56ms?
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Mon, 5 Apr 2010 10:16:47 -0500
(I know, bad subject line...)

Sooo, I'm trying out my new lens, a lovely (even though it's black-nosed)
Zuiko 50 F1.4 lens--greater than 1,100,000 serial numbered jobby.

I'm curious so I try to see if the aperture wide-open is truly F1.4.  Well,
not so sure. (to be fair, I've always questioned the accuracy of wide-open
apertures with many lenses, so bear with me).

Using three different cameras, the E-1, the OM-3Ti and the OM-2S, the
aperture wide-open isn't F1.4, but closer to F1.8.

For example, when tracking the exposures while clicking the aperture ring, I
get nice multiples except for the last wide-open stop.

F16 at 1/8
F11 at 1/15
F8.0 at 1/30
F5.6 at 1/60
F4.0 at 1/125
F2.8 at 1/250
F2.0 at 1/500
F1.4 at 1/640

So, my confusion comes in with the the F1.4 reading. Shouldn't it be F1.4 at
1/1000?  Who took my .56ms?

AG (not nearly as bright as my lenses) Schnozz
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