Re: 18a filter

["David J. Romano" <romano@xxxxxxxx>]

I've shot a few frames of HIE using this filter. In my opinion, there is
not much use for this filter other than for UV photography. It's
expensive and if you want to shoot IR only, you're better off with the
regular IR filters. I shot HIE with this filter to see what effects I
might get by photographing UV and IR light together, but nothing
remarkable happened. HIE happens to be quite a bit more sensitive to UV 
than to IR, so it could make a nice (expensive) UV film. You'd have to
filter out the IR though. One problem with trying to record UV and IR on
the same frame is that the lens cannot focus both at the same time, so
you get a blurry image. You could try double exposing and refocusing in
between. 

Anyway, you should still try it out - and tell us what you get!

Dave
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