> > Both are tested with the same lens and the
> > "demonstration sheet" (for putting behind the shutter) that supply
when you
> > purchase a new 4Ti
>
> What exposure difference do you get metering off the demonstration sheet
> versus a grey card? That will tell us the target film reflectance that
> Olympus is using.
>
> Gary Reese
> Las Vegas, NV
With some replete measurements at different angles, I found the
demonstration sheet reflect 0.2 stop more than a grey card. The grey card
are purchased for a few years but most of time it was stored in an
envelope.
I carried out a test with a T32 on camera, OM4, Zuiko 100/2, demonstration
sheet and grey card. At around 4 feet at F5.6, my flash meter read the
exact value (5.6). At f8 and 11, it is 0.2 to 0.3 stop under, at F4 and
F2.8 it is 0.2 to 0.3 stop over. That means the flash control is not that
exact as wanted.
C.H.Ling
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