Light Piping AND IR transmissive Felts cause fogging.

["Rolland Elliott" <rolland_elliott@xxxxxxxxxxx>]

First of all I’d really recommend doing some research before asking a 
question on this list. So many questions could be quickly answered if one 
just took the time to search the archives at:
http://www.pauck.de/archive/mailinglist/infrared/infrared.html

To answer your specific question see:
http://www.pauck.de/archive/mailinglist/infrared/mhonarc/msg11927.html

What it all boils down to is that George is right with his comments below:

“I asked one of the Kodak infrared guys about
this.  He told me that the light seal is not IR opaque AND that piping is a
problem. Cheers –George”

I sell daylight loadable IR film. The felt is the MAJOR problem. The light 
piping is also a problem, but to less of an extent.

Many people have experienced/seen HIE negatives that have edges that bleed 
into the next frame.  This is lightpiping at work.  Usually most apparent at 
longer exposures greater than 1/60 of a second.  The reason it isn't more 
pronounced is because the angle of incidence is not severe enough and the 
exposure time is too short.

Peace, Rolland
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