Brad Dwyer wrote:
>
> Well I've had my EOS 30 for 2 days now, slowly getting used to it. Just
> thankful I've finally got an SLR. I've been testing what exposure readings
> I'm getting from the camera.. I can't explain it.
>
> In all these I focus/expose on the same location.
>
> Av mode:
> Suggests 1/60 @ f/1.8 w/flash
> Suggests 1/10 @ f/4.0 w/flash
>
> Tv mode:
> As per Av
>
> P mode:
> Suggests 1/60 @ f/4.0 w/ flash
>
> I don't understand why P mode has more latitude with the exposure... Can
> anybody explain this to me?
>
In all those modes your *main* subject (foreground, covered by the active AF
sensors should be exposed correctly. Av and TV are basically fill flash modes,
IOW they try to balance foreground and background exposure to get both right if
possible. In P mode, the main subject has main priority. The background
exposure is considered only of secondary importance. The program may decide
to let the background go dark in favour of a hand holdable shutter speed.
To be more precise, it will NEVER use shutter speeds longer that 1/60 second.
> I'm trying to find out because I'll be taking some shots in a restaurant
> tomorrow night, and so it will probably be a low-light occasion. I'll be
> using ISO 800 handheld, and so I'm trying to figure out if there is
> something I'm missing while using Av/Tv modes. I'd prefer not to use the P
> mode, but so far I can't get acceptable shutter times with Av mode in dull
> light. Any help appreciated!
My approach in this kind of situation is either to use one of the fill
flash modes, if you can live with the slow shutter speeds (tripod) or
wide open aperture (shallow DOF), or to use M mode (which is still TTL
flash metering) to have full control over ambient exposure.
Thomas Bantel
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