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Originally posted by earth2
Ok, here is his repsonse when I asked him how he got the picture...
"I couldn't see the waterspout until I looked at the photo. It was after dark, and the sky was dark except for the lightning. I shot about 25 shots at iso 800, f6.5 and 1/8 sec, triggering the shutter when I saw light. The lightning was very strong and was making multiple hits with each bolt, so I captured a few of them. In this photo, taken 11 minutes earlier, you can see the waterspout forming near the top of the image."
Second message: "There was so much lightning in that area that I figured there may be a tornado sort of thing going on, as tornadoes are often accompanied by very frequent lightning bolts."
Awesome Lucky Pic, I say!
[edit on 25-5-2010 by earth2]
Originally posted by CHRLZ
And as many have pointed out, waterspouts just DON'T look like that, anyway.
To me, my best guess is that TWO strikes occurred in that 1/8 sec..
One that was 'slow' (yes, strikes do come in different speeds), and was motion blurred sideways to give the 'spout', and then one much brighter and faster strike, following the first path almost exactly (as they do). That second strike was the one that provided most of the light, and the reasonably sharp silhouette.
The progression of stepped leaders takes a comparatively long time (hundreds of milliseconds) to approach the ground. This initial phase involves a relatively small electric current (tens or hundreds of amperes), and the leader is almost invisible when compared with the subsequent lightning channel.
High speed videos (examined frame-by frame) show that most lightning strikes are made up of multiple individual strokes. A typical strike is made of 3 to 4 strokes. There may be more.
Each re-strike is separated by a relatively large amount of time, typically 40 to 50 milliseconds. Re-strikes can cause a noticeable "strobe light" effect.
Each successive stroke is preceded by intermediate dart leader strokes akin to, but weaker than, the initial stepped leader. The stroke usually re-uses the discharge channel taken by the previous stroke.
Originally posted by smurfy
No better conductor for electricity than water
Google Video Link |
Originally posted by Arbitrageur
..
Hi CHRLZ, great to see you posting here. It would be a most unusual water spout if that's what it is so I agree that's pretty unlikely,
Your theory is an excellent one, as usual. Multiple strikes are common, and I think most strikes have what's called a leader that we usually don't see, that travels "slowly", possibly forming the blurred image that looks like the spout followed by the main strike:
....
Originally posted by wmd_2008
Originally posted by earth2
Ok, here is his repsonse when I asked him how he got the picture...
"I couldn't see the waterspout until I looked at the photo. It was after dark, and the sky was dark except for the lightning. I shot about 25 shots at iso 800, f6.5 and 1/8 sec, triggering the shutter when I saw light. The lightning was very strong and was making multiple hits with each bolt, so I captured a few of them. In this photo, taken 11 minutes earlier, you can see the waterspout forming near the top of the image."
Second message: "There was so much lightning in that area that I figured there may be a tornado sort of thing going on, as tornadoes are often accompanied by very frequent lightning bolts."
Awesome Lucky Pic, I say!
[edit on 25-5-2010 by earth2]
Above is the data for the picture taken with 1/8th of a second shutter speed this is what I THINK has happened the lightning strike has registered as you can see but because of the long shutter speed an effect similar to a light trail has also been pictured due to movement of the camera during the 1/8 0f a second he was on a boat remember.
Here is a light trail of an aircraft taking off
cdn-www.airliners.net...
Originally posted by SvenTheBerserK
Looks real to me as no other blur is visible in the pic as far as i can see.
And water im sure would conduct electricity better than air.