Infrared Focusing-The true Story?

[Russell J Rosener <rrosener@xxxxxxxxxxxxxxxx>]

I was discussing focusing for infra red today with a knowledgeable friend.
He says the official Nikon word is that one should stop the lens down to
f/8 or smaller aperture, and focus normally, with NO focus shift. He
assumes that this is because by using some type of deep red filter, and
focusing through the lens one is already cutting out most blue light for
focusing. He claims that Leica recommends the same thing for infra red
film. Supposedly he has used this for years with good results.
Can anybody verify this method of focusing? It could make life a lot
easier! 

Russ Rosener


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Topic No. 3