Re: IR and flash

["Rolland Elliott" <rolland_elliott@xxxxxxxxxxx>]

>>>>>>Re: IR and flash
A cheap IR filter to place over your flash can be made from a piece of
E6 5x4 film unexposed and developed.  This is visually opaque, but
transmits IR quite well.  And it's a lot cheaper than an equivalent 87
filter.>>>>>>>

If only that were the case! Unexposed E6 looks like a 2x to 4x neutral 
density filter when viewed through an IR sensitive camcorder with an 88 A 
filter ( close to an 87 filter) . An 87 filter/gel looks like a clear piece 
of plastic.  Given this information, I'd buy the 87 filter. You can get them 
on ebay for about $12 to 14 bucks and in my opinion that is worth the extra 
stop or two of flash power you will get. Besides not too many IR shooters 
have unexposed 4x5 sheets of E6 film around, and not too many labs even 
process the stuff. You might spend an hour calling/driving around trying to 
get some free E-6 film scraps. Unexposed & developed E-6 will work, but 
you'll loose some light output.  Be sure to allow at least an inch of space 
inbetween the gel and the flash head to disappate the heat. 87 gels fry 
really easily!  There's also a place that sells IR plexiglass on the web, 
look in the archieves for info.
Peace Rolland
P.S. I was being sarcastic about the S.Nut Zippers, Perhaps you zealots 
should form your own S.N.Zip mailing list?



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