That's interesting. So you're talking super-high frame rates! NASA and DoD-type stuff. Yeah bigger budgets not optional!
Nick A
________________________________
From: Tesla <tesla-bounces@xxxxxxxxxx> on behalf of Chris Boden <cboden@xxxxxxxxxxxxxxxx>
Sent: Tuesday, June 5, 2018 8:30:01 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] High FPS cameras
Hi Nick, Matt, greetings :)
The 240FPS you're going to get from an overcranked Sony won't show you
anything but mellow flowing arcs. We tried that with a Rx100MkV (it's what
the Captain's Blog series is shot on) and even with our big FS-100. 240
Frames is great for slow-mo at human speeds, but not this stuff.
Even at 17kFPS we can't get much of what we want. We were trying for
stepped leaders, Project Thumper discharges, and Project Groucho's Marx gap
going off.
Our next step will be getting a serious high speed camera (up in the
250,000FPS and faster range). But those come with 6-digit pricetags and
it's a long, long way down on the budgetary wishlist.
I support anyone who wants to try this, when it comes to shooting arcs in
high speed I certainly wish you the best of luck trying to figure out the
lighting. We've never really figured out how to do it well.
I think that just means we need to screw around with it more though. :)
On Tue, Jun 5, 2018 at 2:58 PM, Matthew Sweeney <msweeney23@xxxxxxxxx>
wrote:
> Hey Chris, well that is certainly far above the frame rate I expected. I am
> most interested in observing the stepped leader effect in a controlled
> environment (if possible), similar to an actual lightning strike.
>
> Therefore this might apply more directly to static discharge from a VDG?
>
> Thanks!
>
> Matt Sweeney
>
> On Mon, Jun 4, 2018, 10:30 PM Chris Boden <cboden@xxxxxxxxxxxxxxxx> wrote:
>
> > We can do up to 17kFPS here at the lab. Is there anything in particular
> > you'd like to see? I know we've shot some high framerate video of our
> coils
> > in the past. If you dig through https://www.youtube.com/user/
> thegeekgroup
> > you'll likely find some.
> >
> > On Mon, Jun 4, 2018 at 3:50 PM, Matthew Sweeney <msweeney23@xxxxxxxxx>
> > wrote:
> >
> > > It seems like people are starting to post slow motion videos online of
> > > lightning using new consumer cellphones.
> > >
> > > I've seen up to 1000fps if you can time it just right (you only get .2
> > > seconds), or 240fps with less need for precison.
> > >
> > > Due to the controllable nature of a Tesla coil (and VDG to a certain
> > > degree), I'd be very interested to see any such footage if members
> happen
> > > to have those devices.
> > >
> > > You may not even realize you have a cellphone with such capabilities so
> > you
> > > might want to check just for your own benefit :)
> > >
> > > Matt
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxxxxxx
> > > https://www.pupman.com/mailman/listinfo/tesla
> > >
> >
> >
> >
> > --
> >
> > Chris Boden
> > President
> > The Geek Group National Science Institute
> > www.thegeekgroup.org<http://www.thegeekgroup.org>
> >
> > --
> >
> >
> > This email may contain confidential and privileged material for the sole
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--
Chris Boden
President
The Geek Group National Science Institute
www.thegeekgroup.org<http://www.thegeekgroup.org>
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