Sheesh! Get a flash meter and use an OM-G in manual mode. Just a
fraction of the cost of a 3Ti and perfect flash exposure including the
ambient with no chimping required. :-)
Dr. Flash
Ken Norton wrote:
>> OK, but it doesn't take an OM-3Ti and T45 to do that. The beauty of it is
>> the constant aperture setting, yes? On the OM-2S, a + or - exp comp
>> changes the aperture, doesn't it?
>
> Well, yes and no. The exposure compensation dial is really only adjusting
> the ISO setting. When you are in full-auto mode with the 2S or 4T, if you
> are starting at ISO 400 and adjust the exposure compensation dial to +1.0,
> you've actually turned the internal ISO selector to ISO 200. That's why, on
> the OM bodies, the rings are co-located.
>
> The TTL flash works in TTL mode only in Auto on the 2S and 4(Ti). As such,
> if you dial in -2/3 exposure compensation it is not only "dimming" the flash
> by 2/3 a stop, but it is also altering the entire exposure accordingly--ie.,
> the ambient exposure. This is why you cannot effectively adjust fill-factors
> with the OM system.
>
> To the best of my knowledge, neither the OM-2(md,n,s) or OM-4(T,Ti) will
> operate the flash in TTL while in manual-exposure mode. The OM-3Ti allows
> me to dial in a fixed shutter speed up to 1/60 second and any aperture. If I
> want to keep my flash from blasting the snot out of someone's face, I can
> use exposure compensation to weaken the flash, but my ambient exposure
> remains fixed.
>
> That said,...
>
> I did extensive testing with the OM-2S/T45 and this camera seems to work
> better than the OM-4T in the following scenario--not that the 4T is a dog,
> but the 2S seems to have a slightly different set of rules in the
> algorithm: When shooting in Auto exposure mode with TTL flash, you adjust
> the aperture till the indicated shutter speed is no faster than 1/60. Any
> faster and the flash will not fire. The 2S forces the shutter speed DURING
> exposure to 1/60, but the scale will show the required exposure for the
> ambient lighting. As a general rule of thumb, I always try to keep the
> scale showing between 1/8 and 1/30. At 1/15, this puts the ambient exposure
> two stops down which seems to be about the perfect ratio for me.
> Unfortunately, this means that I cannot use the TTL flash-control for
> fill-flash as the ambient exposure is showing at 1/60 or faster and the
> flash will fail to fire. I honestly haven't spent enough time with the 4T
> in this scenario to determine exactly how, in predictable terms, how it
> works in comparison to the OM-2S but it seems to fire the flash if the
> ambient exposure is showing 1/60 whereas tthe OM-2S doesn't.
>
> So, for outdoor fill flash where my background is notably brighter than the
> foreground, it is not possible to use TTL flash as the flash will not fire.
> But that's where the OM-3Ti is different. The OM-3Ti will fire the flash no
> matter what. So, I can go ahead and adjust my aperture (shutter speed is
> generally fixed) for the background, placing it high-key and using the TTL
> flash to fill the faces. However, to keep from getting that over-flash
> look, I would adjust the exposure-compensation dial down, say -2/3 to fill
> the shadows but not get the flat look.
>
>
>> It would take balls if you were shooting on transparency film!
>
> I'm not that much of a man.
>
> AG
--
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