[pure-silver] IR FILTERS
- From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 19 Feb 2011 16:20:16 -0400
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
Please check my website: <http://www.bobkiss.com/> http://www.bobkiss.com/
"Live as if you are going to die tomorrow. Learn as if you are going to
live forever". Mahatma Gandhi
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