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Photographically Stopping A bullet
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Aug 2, 2021 14:22:39   #
Elias Amador
 
You might try a Vela flash, here is their blurb: http://www.vela.io/vela-one-high-speed-flash:

" VELA ONE HIGH SPEED FLASH
VELA POP HIGH SPEED SOUND TRIGGER

Vela One: The fastest flash in the world
The Vela One is the fastest flash you can buy. Take pin-sharp photos of supersonic bullets and explosions using a normal SLR. The pulse width is adjustable between 500ns (1/2,000,000 sec) and 5µs (1/200,000 sec), which is fast enough to freeze a high velocity rifle bullet in flight.

Your flash is too slow. High speed photography relies on a fast flash. Just like shutter speed with action photography, it's the duration of the flash that is important when capturing bullets and explosions. A typical speedlight has a duration of around 1/20,000 second (50 microseconds) on its fastest setting. This may sound fast, but a bullet will travel over 5cm or two inches in that time and will be so blurred it's almost invisible. Studio flashes are even slower. For pin-sharp shots you need a much faster flash, and the Vela One is 100 times faster. With a flash speed starting at 1/2,000,000 second, or 500 nanoseconds, the Vela One will stop a supersonic, high velocity rifle bullet in its tracks.

WHAT'S WRONG WITH HIGH-SPEED PHOTOGRAPHY
We've all seen the beautiful high speed shots of bullets passing through playing cards and apples. If you want to take these sort of photos today, you will either need a high speed camera costing tens of thousands of dollars, or a dangerous and expensive air gap flash. These use a high voltage spark to generate the short, bright flash needed. As they run at over 25,000 volts and need regular and dangerous electrode replacement, it's not surprising you can't buy them commercially. If you want one you either need to buy a vintage one for thousands of dollars, or you must build one yourself. Many super talented people have done this, but it's not an option for most of us. We wanted to solve this.

THE VELA SOLUTION: A MILLION LUMENS
To solve the problem we turned to LEDs. Until now this has been impossible, as high speed flashes need to be extremely bright in order to get enough light onto your sensor in such a short period. We worked out we'd need to aim for up to one million lumens. If we used regular ultra-bright (500lm) LEDs we would need around 2000 to achieve this. This is obviously far too expensive and impractical. Instead we turned to the latest "chip-on-board" LEDs. These are designed for for applications such as exterior lighting of large buildings. Even at ten times the brightness of the regular LEDs we'd need 200 of them, which is still far too expensive and impractical. This is where we had to get clever. After months of experimenting with different circuits and LEDs, we have built a circuit that drives nine LEDs up to 20 times brighter than rated, without damaging them or overheating, pumping out up to one million lumens. We've flashed our test units hundreds of thousands of times, and they power on through. That's years of normal use, and far longer than a speedlight will last."

The great photos of apples + speeding bullets make downloading the Vela web page worthwhile. I was unable to copy them here.

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Aug 2, 2021 14:31:09   #
Buckeye73
 
The Vela Flash sounds like it would work but I don't want to spend $1,500. for one project.

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Aug 2, 2021 14:39:37   #
Shutterbugger2 Loc: Chicago
 
As I recall from reading his book, Edgerton used a 1 micro farad capacitor operating at 20,000 volts, to power an air spark. The spark traveled along a quartz tube that served to quench the spark for shortest duration.
I forgot how he triggered the spark.
As I recall the book was Electronic Flash, Strobe (1970). I seem to have misplaced it.
~Bob~

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Aug 2, 2021 14:54:08   #
Elias Amador
 
Edgerton's book: 'Electronic Flash, Strobe' is available from Amazon for a mere $175 to $1,255 - cheap. His book: 'Flash, Seeing the Unseen' is also a bargain, at some $1,400. When you buy a copy, please lend it to me.

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Aug 2, 2021 15:15:32   #
bdk Loc: Sanibel Fl.
 
get a pellet gun and hollow pellets ..they will look a lot like a 9mm bullet .. try stopping one of them, many shoot at speeds of 480 FPS , you may be able to get it coming out of the apple. just a thought ,

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Aug 2, 2021 15:19:17   #
TomiGami
 
Since the blur is in one direction and the background is constant, how about shrinking the image in one direction to unblur. Just a theory. You know the length of the streaking bullet and the length of a bullet. Their ratio should provide a shrink ratio. Easy to try.

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Aug 2, 2021 15:19:57   #
Vaun's photography Loc: Bonney Lake, WA
 
Buckeye73 wrote:
I tried to get a photo of a 9mm bullet after it passed through an apple but my set up is not fast enough. I used a Miops Trigger set to the sound mode which would set off the flash set at 128 power. The camera was on bulb mode programed for 3 seconds. I used a 30 inch cubed box that I lined with black foam board to get a dark environment. I could get decent photos of the muzzle flash and the apple exploding but nothing of the bullet. The speed of the flash is based on the shortest flash duration. The flash I used was a Nikon SB800 which gives a flash duration of 1/41,000
of a second. Further research indicated it would take a flash duration of 1 millionth of a second to totally stop a bullet.
How can this be done economically?
I tried to get a photo of a 9mm bullet after it pa... (show quote)


Nice images anyway! Some interesting ideas put forth on how you might be successful in capturing the bullet in flight. Hope you can succeed without spending a fortune!

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Aug 2, 2021 15:40:32   #
mundy-F2 Loc: Chicago suburban area
 
Buckeye73 wrote:
I tried to get a photo of a 9mm bullet after it passed through an apple but my set up is not fast enough. I used a Miops Trigger set to the sound mode which would set off the flash set at 128 power. The camera was on bulb mode programed for 3 seconds. I used a 30 inch cubed box that I lined with black foam board to get a dark environment. I could get decent photos of the muzzle flash and the apple exploding but nothing of the bullet. The speed of the flash is based on the shortest flash duration. The flash I used was a Nikon SB800 which gives a flash duration of 1/41,000
of a second. Further research indicated it would take a flash duration of 1 millionth of a second to totally stop a bullet.
How can this be done economically?
I tried to get a photo of a 9mm bullet after it pa... (show quote)


I do not have any help for you, but the apple shot is nice.
Mundy

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Aug 2, 2021 16:14:31   #
BartHx
 
It was the general's apple, but it was rotten to the corps.

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Aug 2, 2021 16:29:30   #
GMAT
 
Buckeye73 wrote:
I tried to get a photo of a 9mm bullet after it passed through an apple but my set up is not fast enough. I used a Miops Trigger set to the sound mode which would set off the flash set at 128 power. The camera was on bulb mode programed for 3 seconds. I used a 30 inch cubed box that I lined with black foam board to get a dark environment. I could get decent photos of the muzzle flash and the apple exploding but nothing of the bullet. The speed of the flash is based on the shortest flash duration. The flash I used was a Nikon SB800 which gives a flash duration of 1/41,000
of a second. Further research indicated it would take a flash duration of 1 millionth of a second to totally stop a bullet.
How can this be done economically?
I tried to get a photo of a 9mm bullet after it pa... (show quote)


Adam I warned you not to bring that apple near me.

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Aug 2, 2021 16:31:30   #
hpucker99 Loc: Anchorage, Alaska
 
chrisg-optical wrote:
You can experiment with different materials and also the thickness. There will be some slowdown with enough material and the right kind of material. If five sheets don't work try 10, 15, 20, etc. Softer materials might work better. Materials to try - cardboard, leather, thick cloth, RUBBER.

The other technique to slow down bullets might be curved piping - this can be dangerous though...I recently watched a video on YT where someone experimented with different bends of curved piping (including the U-turn suicide special). Surprisingly the bullet followed the path of the pipe in most cases. The piping needs to be fairly thick (steel) otherwise it will just blow out the side. I would not recommend the pipe technique...you can ask the last guy who used the pistol below....oh well, you can't he's not around anymore...
You can experiment with different materials and al... (show quote)


You can find these in estate sales....

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Aug 2, 2021 16:45:12   #
GMAT
 
Adam I warned you not to bring that apple near me.

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Aug 2, 2021 17:06:42   #
Julian Loc: Sarasota, FL
 
hcmcdole wrote:
I think you may be off by a factor of ten? It should be 0.029 feet or 0.36 inches.



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Aug 2, 2021 17:18:49   #
JBRIII
 
Julian wrote:


I can't express how much I agree!!!!!

I know it is not proper to say, but so true. By the way my wife of 49 yrs agrees.

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Aug 2, 2021 17:23:00   #
JBRIII
 
A few months ago, my interest of the moment was high speed photography. Lots of old books available. Imaging trying to do 100,000 frames per sec. with film. Not just a lighting problem, film does not like moving at those speeds.

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