Mark Coniglio
TroikaTronix
/ Moderator
Nov 18, 2008, 4:08 AM
Post #1 of 1
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Infra-Red Techniques, for the Record
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Since many want to know more about Infra-red tracking, here's some info I send out when people ask questions about it. This is just to have it here on the forum for the record.
Best,
Mark
I used an old Sony Digital8 camera that can't record anymore for 16 Revolutions. It has the "Night Shot" feature (which, as far as I know, only Sony cameras have because they have a patent on it.) So, I turn on "night shot" and add a Lee #87 Infra Red Filter in front of the lens. (See example at
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=102760&is=REG&addedTroughType=search
Another option is to use a B&W security camera -- they are already sensitive to infrared light. B&W Cameras will be cheaper for sure, I think, and since you don't really know how well it will work, it would be good to spend as little as possible (unless you know you can get your money back if you are not happy.)
To flood the stage with infra red light, we use a sandwich of gels (filters) in front of standard stage lighting instruments.
Roscolux Colors #19 x 2 (two sheets)
#83 (one sheet)
#90 (one sheet)
Apparently, Roscolux gel is hard to get in Europe, but there are Lee equivalents -- though I don't have the numbers for those. The most important thing to know is that you cannot turn the lights up higher than 50%, otherwise the gel will burn through very quickly. More lights and a lower brightness is the road to success in this case.
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Mark Coniglio / TroikaTronix
Creator of Isadora
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