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This topic comprises 2 pages: 1 2
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Author
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Topic: 12,000 fps film camera!?!
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Josh Jones
Redhat
Posts: 1207
From: Plano, TX
Registered: Apr 2000
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posted 08-19-2002 11:39 PM
It is possible, although at that speed, you need an extremely fast film or LOTS of light. a 2000 foot reel will only last a second or two. They can get away with that by using a prism shutter and having the film move continuously through the camera gate.its been done for years, the Photosonics cameras can reach several thousand frames per second. Randy, all camera stock is acetate, mainly to protect the mechanism in the event of a film jam, the film will just shear. Somewhere around here I have video tape of a photosonics camera running through a roll of film in about 3 seconds. cool to watch ![](http://www.film-tech.com/ubb/smile.gif) Josh
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 08-19-2002 11:40 PM
It isn't as impossible as you might think....I'd be willing to wager a rotating prism is used instead of a claw/shutter. Then, I'd be willing to wager each frame has to be hand centered to remove instability associated with the process. At least, that is how they had to be done in the good old days.Steve ------------------ "Old projectionists never die, they just changeover!"
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 08-20-2002 01:55 AM
The film doesn't have to mode that fast, these cameras use 16mm film, and it moves continuously, and it runs up to that speed, so the acceleration, is within what the film can stand. I seem to remember that the film stock uses a longer perforation pitch to normal camera stocks, I'm not sure if this just means normal .03" rather than 0.2994 short pitch used in normal cameras, or something else again. John?You need fast film, and a lot of light, but not for very long; try the 1.75 second duration PF330 flashbulbs from www.meggaflash.com . They are not cheap.
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 08-20-2002 05:52 AM
Some links: http://www.alangordon.com/r.hispeedpin.html http://web.umr.edu/~boom/facilities.html Spin Physics was a subsidiary of Kodak for many years. Their high speed video cameras (12,000 fps) are used throughout the world: http://web.umr.edu/~boom/photo2/sp2000.jpg Many Kodak camera films are available on ESTAR polyester base and with "long pitch" perforations for use in high speed instrumentation cameras. Most of the automobile "crash tests" are still captured on film. ------------------ John P. Pytlak, Senior Technical Specialist Worldwide Technical Services, Entertainment Imaging Research Labs, Building 69, Room 7525A Rochester, New York, 14650-1922 USA Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243 e-mail: john.pytlak@kodak.com Web site: http://www.kodak.com/go/motion
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