----- Original Message -----
From: "BOB KISS" <
bobkiss@xxxxxxxxxxxxx>
To: <
pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, February 19, 2011 12:20 PM
Subject: [pure-silver] IR FILTERS
> DEAR LIST,
>
> I recall a recent conversation about IR film
> and black skies. A
> few years ago someone also asked me to find the filters I
> used for IR. I
> finally uncovered them. They are:
>
>
>
> 1) Harrison and Harrison RD-10 (a.k.a. 88A) through
> which you can see a
> tiny bit of daylight. The directions say, "I.R. filter
> absorbs visual below
> 710 mu).
>
> 2) Kodak Wratten 87C gel filter. Even if I look out as
> the sun lit
> tropical sky it is OPAQUE! To see the transmission
> spectrum of the 87C
> click
http://www.beyondvisible.com/BV3-filter.html and
> scroll down past the
> UV filters to the IR filters.
>
>
>
> CHEERS!
>
> BOB
It would be interesting to use the 87C as a transmission
filter, its output would probably make things fluoresce.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
