Re: Odd marks on negative -- help needed

[Eric Apgar - GAR <apgar@xxxxxxxxx>]

Hi Steve,

I can't help with the streaking, but I do have a question. I bought some 
of the MACO IR and plan to try it soon both outside and inside under 
studio lights. How do you shoot it in the studio? What filter and how do 
you meter? I take all my film to local labs for development, and I talked 
to one of my labs about the MACO and he said he could not track down any 
numbers for developing MACO in TMAX (the developer he likes to use). If 
you could share your MACO in TMAX numbers, that would be great.

cheers,
eric apgar
apgarphoto.com


>In need the list's advice about some odd marks on my
>negatives. Occasionally with past rolls of Kodak IR
>Aerographic (70mm), and on almost every frame of the
>latest roll I bought, I am getting stains or marks on
>the negative. These appear as lighter wavy lines
>wandering across the print or contact sheet, about 1mm
>wide. You can see a sample contact sheet at this URL: 
>
>	http://members.cruzio.com/~shomer/stain.jpg
>
>I had processed this film for three years with no
>trouble. I use TMAX-RS developer as a 1-shot developer
>(no reuse or replenishment); Kodak indicator stop;
>Lauder non-hardening fixer; and Heico hypo-clear; with
>a final rinse in Kodak photo-flo. Mixing all the
>chemicals fresh makes no difference in the
>stains/marks, and TMAX 100 or Maco IR processed in the
>same stop, fix, and hypo clear do  not show these marks.
>
>The only changes in my processing recently are:
>switching from Ilford fixer to Lauder, and from Orbit
>Bath to the Heico hypo-clear. I didn't notice that the
>problem started when I switched to either of these
>chemicals, but that is possible.  
>
>Does this seem like a manufacturing problem in the film
>or a processing problem? Is it plausible that the
>change of fixer or hypo-clear is to blame? If it's a
>processing problem, can anyone offer a suggestion for
>avoiding it? Any advice would be appreciated. 
>____________________________________________________
>Steve Homer    shomer@xxxxxxxxxx   Santa Cruz, CA  USA
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