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Re: [OM] Dude - Who stole my 0.56ms?

Subject: Re: [OM] Dude - Who stole my 0.56ms?
From: Frank Wijsmuller <Frank@xxxxxxxxxxxxxx>
Date: Mon, 5 Apr 2010 17:43:41 +0200
At the risk of annoying you, aren't you looking for .36ms?
BTW, I'm slightly disappointed that you don't have some theory ;-)
On my e-p1 with 1.2/42mm it is also quite lineair until the largest
diaphragm
2.8   250
2      500
1.4   1000 (actually a dot on the lens, I expect it to be 1.4)
1.2   1250
However, sometimes there is no difference when opening from 1.4 to 1.2. No
idea why. Anyone?

Regards, Frank.


2010/4/5 Ken Norton <ken@xxxxxxxxxxx>

> (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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