[photo-3d] Re: lightning trigger

[allanwx@xxxxxxxxxx]

--- In photo-3d@xxxxxxxxxxx, Ron Beck <rbeck@xxxx> wrote:
> I know I've seen circuits that you can build that will sense a flash
> (lightning) and trigger the camera.  I'll have to do some "surfing" 
to
> see if I can find it again.  Or, maybe I'm thinking about some sort 
of
> sound-activated trigger.  Can't quite remember right now.
> 
> Regards,
> Ron

The idea of using a sound-activated trigger to photograph lightning 
reminds me of an addendum to a biology slide show I saw in college.  
The presenter showed his "After the Lightning" pictures at the end of 
his presentaion.  He stood on a bluff and watched for lightning and
as 
soon as he saw it he clicked the shutter.

What is the speed if light again?  What is the duration of a flash?

When the clap of thunder comes rolling along, we'll click the
shutter.  
I like that idea - reminds me of how administrative policies are set
- 
but that's another post to a different list.

allan-"Dilbert"-wx