Re: IT LIVES! "Bizarre" dot explanation

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Nir Weingarten <nirzvi@xxxxxxxxx>

> Original poster: "Scott Hanson"
> <huil888@xxxxxxxxxxxx>
>
> Nir -
>
> It appears you have several different things going
> on to create "bizarre
> dots" in your coil photos.
>
> The first type are round, bright dots of light in a
> relatively straight or
> slightly curved line, usually passing through the
> geometric center of the
> photo. These are caused by internal reflections
> within the lens of the
> camera, each air-to-glass surface creating a
> reflective surface. To create
> these distinct reflections, you need a very high
> intensity point source of
> light. In Tesla coil photos, this is almost always
> the spark gap. Because of
> the different spacing between the surfaces of the
> lens elements, the dots in
> the photo will have different spacing between them.
> Even in a cheap camera,
> most or all of the lens elements will have
> anti-reflection coatings on all
> surfaces, but the light from the spark gap is so
> intense that reflections
> still occur. This phenomenon can also be seen in
> outdoor photographs at
> small lens apertures when the sun is within the
> field of view.
>
> In other photos, there is a second, identical but
> dimmer image of a
> streamer, offset slightly to the right of the main
> streamer. This is also
> almost certainly the result of internal reflections
> within the camera lens.
>
> Steve Connor's still-from-video photo is a bit
> different, with two vertical
> columns of bright dots at a perfectly uniform
> spacing. These dots are
> created more complicated mechanism, usually having
> to do with the pixel
> scanning process within the CCD. Note that in
> Steve's photo, these columns
> of dots are directly aligned with the with the spark
> gap. I think they might
> be caused by pixel saturation or memory effects in
> the CCD. I have also seen
> continuously moving, random "snow" dots in video
> shots that were not aligned
> with any optically bright feature in the camera's
> field of view and that
> seem to be caused by electromagnetic interference
> with the camera's CCD or
> CCD scanning process.  These random "snow" dots
> would greatly diminish or
> disappear entirely when the camera was moved a bit
> further away from the
> coil.
>
> Regards,
> Scott Hanson


Thats a good argue for all of the dotted pictures that
have the spark gap in frame, but there's not many of
those...

Another type of phenomenon is still unexplained: the
yellowish-reddish bursts


Cheers
Nir Weingarten, Israel


Best wishes

                                              Nir(NOT NEAR) Weingarten

Israel



		
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