Re: #25 vs. IR filter

[glsmyth@xxxxxxx]

Date sent:      	Thu, 29 Apr 1999 01:29:30 -0400
From:           	Hondo <btl3@xxxxxxxxxxx>
To:             	infrared@xxxxx
Subject:        	Re: #25 vs. IR filter
Send reply to:  	infrared@xxxxx

> George L Smyth wrote:
> 
> Although meters are sensitive to infrared radiation, they are not
> calibrated for it.  Everyone's meter could be wildly different in this
> respect.
> 
> This is why I meter through a #25 filter, then add 2-4 stops, depending
> upon the scene.
> 
> George L Smyth
> HandMade Photographic Images
> http://www2.ari.net/glsmyth/
> 
> But you do use an 87c BTR, right? Just use the 25 for metering?

That's correct.  I have a several cameras, so this allows me to use one 
method, as opposed to trying to calibrate each camera and my spot meter.  I 
use an 87C and a Hoya R72, which cuts at 720nm.

Cheers -

george
George L Smyth
HandMade Photographic Images
http://www2.ari.net/glsmyth/
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