Ball lightning!

plasmanu · by **plasmanu** » 01/07/12, 14:10

Surely
I re-edited the photo zoom. Android is not strong on this one: long live the PC.
It looks like a myriad of stars.
As if the drops of water were shining like in the middle of the night.
I had to do 100 photos to capture the moment.

plasmanu · by **plasmanu** » 01/07/12, 18:28

And on that one, I taught the children to count to 3.
It was like a July 14th under fireworks.
Between the visual lightning and the sound deflagration.
3 .. 2 .. 1 .. Crack ...
Lightning at 1 km, 3 seconds after the noise.
Sound propagation

When it fell on the lightning rod of the virgin of the church, I missed it: too bad. : Cry:

plasmanu · by **plasmanu** » 10/07/12, 06:28

Nice report on lightning hunters on France5

They recycled a Cold War device with 80 helium cells rotating at 1.5 million images per second over 30 seconds for $ 500000.
Like the Kalashnikov compared to the 1 shot musket.
Hey bin as soon as it turns: the electric field erases the data ...
Saturating cells and hard drive.

Link to the video : Arrow:

nature photographer_storm hunters : Arrowl:

(being uploaded, available around 07:30 am)

elephant · by **elephant** » 10/07/12, 10:31

Very well your little Youtube channel, Plasmanu. Keep on going !

Obamot · by **Obamot** » 10/07/12, 12:31

Rabbit wrote:
Plasmanu wrote:It has just cracked a violent storm.

I got a weird photo.
Big electro magnetic bug

Maybe the camera cell was saturated by
light.

The lightning may have taken place, while the curtain of your camera was just opening! If so, it would not be an electromagnetic effect amha.

To understand it better, you need to know how the photographic shutters work, to interpret any artifacts:
- First, you have the curtain which opens from top to bottom (or vice-versa) and travels in front of the sensor at full speed but as if you were opening a blind,
- secondly, when the exposure time has ended, the curtain closes following the same stroke.

There are flashes that have little programming in "second curtain", that is to say that the flash goes just before the curtain closes, which allows to avoid or do (it depends on the subject and its displacement) of the effects of streaks without altering the main subject of the image by the flash!

In the case which concerns us, the flash of the lightning intervenes like that of a camera, but unexpectedly without the cell having had time to react (or whereas it had time and that it precipitously interrupt the exposure => what happens when the calculation is done on the “sensor plane”). And so the portion of the image correctly exposed, corresponds to the correct calculation of the cell. The other portion being the one that received the flash of lightning.

What we see on your photo, would be the manifestation of this phenomenon, which would be "a physical obstacle" and not a disturbance induced by a "big electromagnetic bug". There, but it's just my feeling.

Alain G · by **Alain G** » 10/07/12, 13:28

Eh eh!

Obamot, I think you're having fun!

A shutter on a digital device?

I had the same result on my digital camera which poorly restored the photos, the problem seems to be an image compression bug.
: Shock:

Obamot · by **Obamot** » 10/07/12, 13:37

No shutter on a digital camera ... You're kidding I hope:

http://www.youtube.com/watch?v=6x_YXj0vWVM

2nd curtain flash sync on digital device:
http://www.magic-photo.com/minolta/dynax7d.htm

http://www.photocool.fr/Forum/viewsujet ... fdcdf5b5d0

http://forum.hardware.fr/hfr/Photonumer ... 0878_1.htm

plasmanu · by **plasmanu** » 10/07/12, 13:53

the photo is from my samsung galaxy Note: this is not a camera.
only an HD cell.

I can only change the mode.
-landscape
-portrait
-night
-sport
...

Alain G · by **Alain G** » 10/07/12, 13:53

Ok well there's a shutter but how do you explain that we perceive the top of the building at the top right when the lightning is gone?

Obamot · by **Obamot** » 10/07/12, 14:00

.... pffff no shutter huh .... : Cheesy:

if you're as good at audio ...

plasmanu wrote:the photo is from my samsung galaxy Note: this is not a camera.
only an HD cell.

It is however simple: the lightning that you perceived very close covered in light the lightning of background. And to say that there is no shutter on the Samsung, you know absolutely nothing about it, and it is going a little quickly in work.

In my opinion there is one, because on the "minus" sensors found on laptops, the sn / b ratio is very unfavorable, except the only way to have the least possible is to put a shutter, because any sensors with electronic shutters are very very expensive (for example in telescopes, but cooled with helium or something ...).

Other laptop manufacturers have removed the curtain shutter, the diaphragm of the camera does it! Reason why it is useless to put a sensor without curtain in a portable: too expensive my son!

It is my feeling, even if I do not know absolutely all the technologies used. After you still have to see the quality of the photos: yours seem exceptional in these light conditions, so it's not very low-end : Mrgreen:

3rd hypothesis: what you relate, with an electronic sensor and shutter and potentially sensor based on Exmor-R backlit. But it does not stick with your photo which is not "rolling-shutter».

No, in my opinion, you were not a victim of this "rolling-shutter"(Shutter = curtain):
http://en.wikipedia.org/wiki/Rolling_shutter

Because in this case, there would have been no lightning bolt!

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