Re: 70mm CIR Focus Point

[BIELECKJ@xxxxxxxxxxxxxxxxxxxxxxxxxx]

>
>But the IR-sensitive layer as such still does, yet one cannot have a
>focus shift that suits the entire spectrum. The IR-layer is
>sensitive up to 900nm, and the other visible layers start at 450nm
>(with a #12 filter, otherwise it would run well below 400nm, just
>like HIE without filter). 
>What can be tackled with a focus shift in case of HIE can only be 
>tackled with closing aperture or using an APO lens in case of 
>Ektachrome IR....there is no other way to get this spectral range in 
>focus....

We just shot our first 70mm rolls of the new Aerochrome II 2443 CIR film.  
These were aerial shots of an area that had the beginnings of "Oak Wilt" 
(which is a fungus that attacks and kills Oaks) where we needed to find the 
"epicenter" of the infected area as well the extent of it's spread.  I had 
the lens focused at infinity and came up with some superbly sharp images 
(we used a Rollei 6003/80mm F2.8 PQS set at F 5.6).  I am curious as to 
what would happen with the lens focused at the IR mark and will try that 
the next time we fly..
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