Digital BW, The Print

Actually Gary is wrong, I am afraid, though only partly so. If you  
have a camera converted to have a clear filter, or a relatively weak  
IR filter, like an R72, then you can attach IR filters to the lens to  
limit the spectrum the camera captures. If this is a visible light  
blocking filter then you will not be able to see through the lens. But  
you can get quite good at pointing the camera by eye, especially when  
shooting with a wideangle, or using LiveView on an appropriate camera.  
With the IR blocking filter removed you will get very short,  
handholdable exposures even with stronger IR filters, such as the  
850nm or 1000nm 50% cutoff filters, in full sun.

If you main interest is shooting ir, it is certainly better to have  
the ir filter put in the body so you can use the viewfinder. The  
astrophotographers like the clear filter because it gives them  
extended red sensitivity for the Hydrogen alpha emission line with  
nebula (mainly) and also allows them to capture other parts of the  
spectrum (using filters if necessary).

I had a 715nm 50% cutoff filter put in my 350D (by maxmax.com) and  
love it. I now put stronger IR filters on the lens sometimes for a  
stronger effect.

Cheers,

Wayne

Wayne J. Cosshall
Publisher, Digital ImageMaker for photography, camera and art news,  
reviews and tutorials http://www.dimagemaker.com
Photography, camera, equipment and technique blog http://www.digitalimagemakerworld.com
Personal photography and art site http://www.cosshall.com






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