Re: Wratten 87c filter

[shopper@xxxxxxxx]

Date sent:      	Thu, 25 Feb 1999 14:38:02 -0500
From:           	Hondo <btl3@xxxxxxxxxxx>
To:             	infrared@xxxxx
Subject:        	Wratten 87c filter
Send reply to:  	infrared@xxxxx


. I want to get a more opaque filter, like the 87 or 87c. If I get
> one, what is a good place to start as far as f-stops and shutter speeds
> are concerned? I'm not sure if I'll have to expose longer with this type
> of a filter. I could use a little help here.....  thanks!  

Brian,
Kodak recommends an ISO of 10 with HIE and Wratten 87c.  However, I 
would suggest taking another step and mounting your filter behind the 
shutter--so you can continue to focus.  You can go even another step and 
meter through 87c material at an ISO of about 3200 using D-76 by the book.  
See Andrew Davidhazy's site: http://www.rit.edu/~andpph.  WJ is a good 
source for 87c polyester material.

Jim
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