Quoten Vesa Perala <[EMAIL PROTECTED]>:
> > > But the exposure time would never exceed the limit, e.g. 1/focal
> >length.
>
> >This is exactly what P-mode does. So every EOS-body has it, and we al know
> >the results it's given us.
> >
> >Drikus
>
> It does? So you mean in P-mode the shutter speed never goes slower
> than 1/focal length (with flash)?
> Oh boy... forgot that possibility. 8-|
> I remembered P-mode works the same way with or without a flash.
>
> Unfortunately the aperture is uncontrolled in P-mode, much
> like in Tv-mode. Actually, don't P- and Tv-modes with flash then
> actually function much the same way except that in P-mode also
> the shutter speed gets shorter when light level increases?
>
> I remember there is some difference in fill-flash functionality
> between e.g. P- and Tv-modes?
>
> I don't have TTL flash yet so I haven't had possibility to try
> myself. 550EX is high in my shopping list though.
>
> Vesa
It was late. so I took some shortcuts.:-)
In P mode the camera will choose his time/aperature combination taking in
acount wich focal length you are using. This means that it wants to use a time
of 1/focal length as quick as possible, so with low-light the aperature will be
opened to the maximum of that particulair lens.
When it reaches the 1/focal length point, than it will start to decrease time
and aperature simultaniously, until it reaches the minimum aperature, after
wich only the time will decrease. (This should be visualized in a diagram in
your manual, using the 50/1.4 lens (if my memory doesn't fail me), together
with a visualisation of the program-shift)
With flash P-mode starts to behave different in low light. It doesn't use a
time below 1/60, because at that point the flash will always be your main light
and with the flash as the main light the 1/focal length rule of thumb doesn't
matter anymore (The flash will freeze the subject). So it is always
handholdeable. The fastest time is ofcourse your X-sync, after wich the
aperature is being closed uptil the point of to much light, and the camera
starts warning you. (I presume no FP-flash, as I'm using EOS5 with 430EZ. With
FP-flash the 'normal' curve should be used, but I seem to remember someone
reported some different behaviour)
This is the background of my answer. P-mode will take care of handholdeability
when you use flash, and doesn't have overexposure (Whitin normal limits
ofcourse). So in all situations you will have a correct picture. The
disadvantage is that you have less controle over the aperature and time that
are being used. This is why a lot use M-mode, because this means that you have
beter control over both, and still have automatic flash. Ofcourse you have to
be aware of overexposure ;-)
I use the modes, depending on the situation and desired result.
Drikus.
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