re: filters

[filje@xxxxxxxx (p j geller)]

Yes WJM:
I do recall having some of this same discussion
on the RIT list.

The plastic  (poly-carbonate) filter  was from a surplus mailorder
company and given to me by an associate. I assume it was made
for a battery powered  light source for a sniper scope (otherwise
it would melt).  
It is quite thick (4mm) and was about 85 to 90 mm diameter.
It has since been made to fit a series 9 to 72mm adapter.
The "Wood" effect is quite clearly visible once your eye 
adjusts. I too have considered making goggles, if only
I could find another  filter.   To the man on the street 
you'd look like  "The FLY".  

When an 092 is mounted on a video camera, you get a mild
Ir effect with a lot of red. The plastic filter is neutral and a 
very pronounced ir effect. It is usable only with full sun
on video. I also have a LEE 87 which is not usable with
a video camera.
So can i conclude that an 093 filter is  equvalent to
wratten 87? (seem to have misplaced the B+W catalog
at the moment :~\  


phillip geller
phillip geller photography

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End of Infrared-Digest V0 #650
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