[tig] overexposed neg

john.pytlak at kodak.com john.pytlak
Fri Jun 25 13:32:52 BST 2004


Inadequate developer turbulation in the ECN-2 process can cause 
non-uniformity, expecially when the negative is overexposed. 

Laboratories are well aware of the need for proper turbulation, and 
generally do a very good job in maintaining excellent process uniformity. 
Kodak has a wealth of information and technical help for labs to optimize 
processing parameters:

http://www.kodak.com/country/US/en/motion/support/technical/turbulation.shtml

http://www.kodak.com/country/US/en/motion/support/processing/operating6.shtml

http://www.kodak.com/country/US/en/motion/support/processing/h242/h2402_02.shtml

http://www.kodak.com/US/plugins/acrobat/en/motion/support/processing/h242/h2402.pdf

http://www.kodak.com/US/en/motion/products/mps/index.jhtml?id=0.1.4.28&lc=en

John
(signed by:)
John P. Pytlak
Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, New York 14650-1922  USA
Telephone: +1 585 477 5325
Cell: +1 585 781 4036
Fax: +1 585 722 7243
e-mail: john.pytlak at kodak.com
website: http://www.kodak.com/go/motion



--

If this anomaly appears to be vertical streaking or veiling in appearance 
it
may be attributed to insufficient developer turbulation in the ECN-II
developing process. When Kodak EXR stocks were introduced a number of
laboratories throughout the world had to re-design their developer spray
bars. I'm not sure about the new Vision-2 stocks and how they react to
turbulation.(haven't seen any problems with my process) I doubt 1-2 stop
over exposure would immediately show this problem, certain tonal range and
contrast will exaggerate the problem such as sky scenes, neutral grade mid
tones etc..
Just my two cents
Vinny(lab rat)Hogan
Cineworks Digital-Miami 





Hi David -

I was hesitant to add a comment, but for your own sanity and mine, I will
just say that I have seen the effect you descibe on my Spirit as well...
with overexposed film. I too thought it was wash marks or some very faint
chemistry streaking... but could never see it frequently.... a few years 
ago
when we had a 2nd telecine, It just so happened that I was on a project 
that
had this particular anomoly and Carl VanCamp ( from Thompson ) just 
happened
to be here. I was sure I would get an answer as to what it was... Carl
however, being the smart man he is wanted to see it on the other telecine
before he committed to trying to figure out what it was.... it turns out
that with a similar color correction on an old Rank - the "streaking - 
faint
diffusion collums" were there too. So, Carl became convinced that it was 
on
the film. I have seen the issue a number of times since then, and have 
never
been quite sure it's on the film and not something else.

That's all I can add, but I hope it helps you to know that you are not
crazy, as your email helped me....

Craig Leffel
Optimus.









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