Focus Adjustment on EIR and Black specks on EIR film?

["ROLLAND ELLIOTT (Quality Assurance Co-Op)" <rolland.elliott@xxxxxxxxxxxxxxx>]

<Rolland, the infrared focusing marks on lenses are for b&w infrared, not EIR,
<as EIR does not require a focus adjustment.

I agree and disagree with your comment.
1.   I believe the infrared focusing marks on lenses are for correct focusing
of INFRARED LIGHT regardless of what kind of film you use.
2.  I agree that EIR does not require a focus adjustment under normal uses.  I
think under normal usage with a yellow/orange/green/or/blue filter the two
color layers of emulsion are in focus and therefore make the IR sensitive
emulsion appear in focus.   However, I was using a 87C filter which only
transmits IR light.  If the only light going through a lens is in the infrared
spectrum then one should use the IR light focusing marks on lenses. Right?
The whole reason I did this little experiement in the first place was to prove
that EIR does need focus correction when using an 87C filter.  In my experiment
 I set my zoom lens to 210mm to minimize depth of field.  However, this was a
mistake since at this focal length the lens doesnt require any IR focusing
adjustments.  One of these days I might get around to repeating my experiment
by setting my zoom lens to 70mm.  At this focal length the lens does need IR
focusing adjustment.

Subject Change:  Black specks on EIR film using E-6 developing.

O.K. heres a question for everyone who does their own E-6 developing.
Im getting black specks on my EIR film that I develop using Kodaks 1 gallon 7
step E-6 processing.
Last night I developed a roll of Fuji Sensia200 and a roll of Kodak EIR
together in a Jobo Tank.  After hanging the film on some film clips I noticed
that the EIR had some black specks on it while the Fuji Sensia had no problems
at all.  The black specks looked like dust at first, but on closer examination
they look like little bits of film emulsion.   I washed the EIR film for an
additional 10 minutes in some cold water, but the black specks were still
there.  I finally used a squeege to get the specks off the film, and that
worked.  However, I hate squeeging my slide film, because I know one of these
days I will scratch the emulsion.
I used the recommended times, agitation and temperatures that Kodak prints in
it's literature.  I also mixed all chemicals using distilled water.  Does
anyone have a clue what these black specks are?  I wonder why they were only on
the EIR film and not the Fuji, even though they were processed in the same
tank?

Thanks, Rolland Elliott

Work Phone is 614-772-3537 Home # 614-772-2854
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End of Infrared-Digest V0 #164
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