Hi Tom,
I recently picked up a 540 for my eos5, I will try to answer your questions based
on
two weeks experience. (read: not written in stone)
Tom DelRosario wrote:
> .
>
> * The ceilings in my house are rather high: up to 16 feet in the front room. Since
>light intensity is related to the square of the distance, it would seem that the
>420EX is probably not powerful enough to use in bounce mode under a high ceiling.
>Correct?
--With 400 iso print film and fresh batteries it should work.
>
>
> * If shooting in vertical mode, where should I point the flash, if I want to bounce?
> Do I swivel it up? Combine swivel with tilt? Bounce off the wall instead? Or
>should I just get a flash bracket and not worry about that?
-I've been bouncing it off the wall beside me and it seems to work. I tried holding
the flash above the camera via ocsc2 but I liked the bounced results better.
>
>
> * What is the usefulness of flash diffusers in your opinion? I guess this is a hard
>question, because some people love Omnibounce, others are disappointed. Same is true
>with the Lumniquest series.
-No comment. (don't have one)
>
>
> * This is not a bounce question, but it is an Elan 7/420EX question. Let's say I
>want to use flash as the primary light source. But I also want to control the
>aperture. So I set the camera to M mode and set the shutter to 1/125 and the
>aperture to the desired opening. Question: how do I know if the flash is powerful
>enough to do this? It is my understanding that, in M mode, E-TTL will control the
>flash power such that the selected aperture results in a correct exposure. But the
>meter is just flashing -2 underexposure on my camera at 1/125@f/8 in a small room.
>The flash should be powerful enough to do that exposure, right? But what if I asked
>for an aperture of f/32. Will the camera or flash tell me that it is not powerful to
>correctly expose at f/32? Yes, I have read the flash FAQ, and it does not
>specifically answer this question.
>
- I've been happy with using "M" mode and setting the aperture I want and a shutter
speed appropriate to the lens in use. As for the rest of this question I'm not to
sure how different the 420 is from the 540 so some other list member(s) will be able
to provide more information on that. And if I'm wrong on any of my points, please
someone correct me.
-Shoot some slide film indoors and see what you get back from the lab. You will then
have a better idea of what is going on.
-Dan
>
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