Re[2]: Infrared Basics

["Peter Badcock"<pbadcock@xxxxxxxxxxxxxxx>]

Hi Rolland,
           'twas me who said they use an '89B'.  Thanks for the info, I'll give 
it a try in the next day or so and compare the exposure details to my 
conventional method of metering with the filter off the lens.. (I have an F801s 
myself)

regards

Peter B.
______________________________ Reply Separator _________________________________
Subject: RE: Infrared Basics
Author:  <infrared@xxxxx> at INTERNET
Date:    22/2/98 14:38


Someone wrote:
>I use a Hoya R72, which is equivalent to a wratten '89B'.  One can just see 
>through it with the naked eye, but it is way too dark to have on the front of 
>the camera when metering.

I have a B+W filter that is equivalent to the Wratten 89B and I use it in 
front of the camera when metering.  It is difficult to see through it in many 
indoor situations, but when used outside on a sunny day, it doesn't present a 
problem.  I use it with an N90s and (if I remember correctly) I set the EI to 
4000 (I'd have to double check my notes to make sure).  The reason for the 
very high EI is because this filter hardly lets in any VISIBLE light,& the 
camera meter therefore thinks the scene is very dark.  By setting the camera 
to a very high EI, it compensates for the fact that the N90s' meter is not 
sensitive to near IR light.  I then set the camera to aperature priority and 
take pictures based on the camera's matrix metering system.  I hardly ever
bracket, and if I do it is usually only + or - 1/2 a stop. I developed the film 
in TMax using Kodak's recommended times and agitation.  The resulting negs
look great in quality and quantity.

Just another approach!  Peace Rolland 


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End of Infrared-Digest V0 #409
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