Re: Home Process of 70mm

[BIELECKJ@xxxxxxxxxxxxxxxxxxxxxxxxxx]

This is not a new topic I understand, but the way I did it just may be.  
I've managed to modify a 120 processing reel (widen it about a 1/4 inch--or 
6mm) so it could take a "short" roll--about 12 to 13 exposures--of 70mm 
Aerochrome CIR film.  In the way of background, all of our 70mm work is 
Forestry-related photography using both CIR and B&W infrared film.  Why 
most of our work is better processed by commercial labs specializing in 
this type of long-roll development, we needed the ability to "spot" develop 
CIR in E-6 for certain projects. After managing to locate a 120 reel with a 
plastic core, I cut the thing in half, added the appropriate amount of 
spacers, and came up with a reel that would take 70mm film.  

Needless to say the whole thing has worked and worked well.  The resulting 
E-6 processed CIR film has proven to be very useful for our type of work.

As an aside, processing CIR in E-6 does just what Kodak says it would.  Our 
transparencies do show a shift toward the magenta with an increase in 
contrast also obvious.  

As another aside, if you get the chance, do have your 35mm CIR 
transparencies processed in the recommended AR-5 chemistry.  The 
differences between this and E-6 are astounding!  AR-5 delivers much truer 
IR color that really shows the differences between trees, shrubs and grass.
*
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End of Infrared-Digest V0 #239
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