IR Flash

["Leonard Flanagan" <ldflan@xxxxxxxxxxx>]

I saw the recent posting on IR flash bulbs, and that reminded me of 
something that you have all probably discussed, but perhaps not.  Some time 
ago I got hold of some scrap eighth inch IR filtering plexiglass acrylic 
material.  It's manufactured by Rohm & Haas Canada Inc, West Hill, Ontario, 
M1E3T9.  I cut a piece of this stuff and cobbled together a little slip-on 
filter for an old Olympus flash unit.  To my surprise, a standard flash puts 
out enough IR to work well with HSI.  I've used it occassionally for fill to 
bring out the white in shaded foliage in the foreground, and have used it to 
shoot in semi-dark conditions indoors too.  The flash is quite inconspicuous 
behind the filter -- just a red blip.  I suspect you could do quite a lot 
with this stuff if you had a mind too -- big studio flash filters, etc.  If 
you were careful, I think it could probably also be used as an optical 
filter without degrading images too badly, though you'd be limited to 
rangefinder cameras or scale focusing.  I haven't tried that, though.

Leonard


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