[ATM] infrared filters using film

["Lawrence D. Lopez Software Engineer" <lopez@mv.mv.com>]

My brother sent me this link.
Please understand that it does produce pop ups.
Basically it says that you can use color film
(Kodacolor say) as an infrared filter.

http://www.angelfire.com/space2/tgtan/infrared.htm

What I was wondering was how imporant is the
figure of the surface of such a filter.

I've heard of very accurate filters from Zeiss.
I've also heard that 1000 oaks filters did not have a good figure
and that Coronado did, and that there was some improvement.
But these were fill arperture filters.

Can anyone shed any light on this ?

Does it matter much ?



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