Re: [photo-3d] Multiple flash...

["David W. Kesner" <drdave@xxxxxxxxxx>]

Bill Costa writes:

>I hope we're not getting too far off the topic of 3D by 
>discussing a *general* photography issue, but:

Good flash is essential to good 3D in dark places and dark 
places (like caves) cry out for stereo so it is not off topic.

>I'm curious about how exposures are determined using multiple
>flashes like this.  Being lazy, I'd want to use automatic 
>flash units

Yes, you can use the auto feature of many flashes. Simply make 
sure your camera and all your flashes are set the same and are 
not overshooting their maximum distance.

When I use Vivitar 283's for big rooms I set it at the f4 auto 
setting which makes it good out to about 30 feet (assuming ASA 
100 film) in perfect conditions (in a dark lava tube it works 
out to only about 20 feet). Now just make sure the subject you 
are lighting is 30 feet or closer. You can have one flash 10 
feet from one subject and another flash 20 feet from another 
subject, etc. and get them all lit properly.

Of course, I mainly use bulbs for the big shots and for that 
you must calculate and set the flashes the appropriate 
distance from the subject.

You do need to make sure to not overlap the flash too much as 
you will get hot spots.

All this talk about cave stereo photography has me anxious to 
go, but the bats are still hibernating and we can't disturb 
them for about another month *{;-(

That's all for now,

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx

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