Re: maco ir

[Eckhard Stephan <eckhard.stephan@xxxxxxxxxxx>]

phil wrote:
> 
> OK , the sun came out, there were some clouds and the clip test is done.
> The every other frame on the first 8 (the whole clip) has a light
> strike, most noticable in the later frames around the sprocket holes.
> After reading earlier posts, I opened my tin can in the dark
> and removed the film cassettes from their canisters and put them into
> KODAK IR canisters. /sniplet/
> I loaded my film into and out of the camera in the dark. An all metal
> camera with titanium shutter and no ir transport sensors.
> Yet I still got light leak streaks.
> The film leader tongue is very black. This means that the people at
> Maco put the film cassettes into the canisters in room light.

I agree. I am always hesitant to blame other people for my problems, but
my experience with the film does'nt allow another conclusion, either. 
Meanwhile I am convinced, that the plastic canister has nothing to do
with the fog on MACO IR 820c. I was mislead by my own experiment: As I
wrote in an earlier message, I put a piece of HIE in a MACO canister.
Then I exposed the container to light. When I developed the film, it was
black. Of course, this means that the MACO canister is not IR-proof
regarding the wavelenghts HIE is sensitive to. However, it does NOT
mean, that the canister is'nt safe for the MACO film it was designed
for. I recently repeated my experiment with a piece of MACO film - and -
surprise ! - the MACO film was not exposed at all. This means, that the
MACO plastic canisters should be okay for the MACO film...
I handled the film the same way, that is described in the above
quotation from P. Gellner's message. Nevertheless I still got a fogging
problem: On all 3 MACO IR films that I shot so far, the leader was
heavily exposed. I also got fog on the first 10-14 frames. The fog is
especially dense near the sprocket holes. On the first 4-8 frames, the
picture itself is also affected. 
Yesterday I took a fresh roll of MACO IR from a container, which had
never seen any light at all (at least at my home). I cut off a few
inches of film from the beginning and developed them. I found the same
kind of fogging I had also seen on the previous rolls. 
IMO, there is only one possible explanation for this, if you don't
believe in paranormal phenomena ;-) : The tin cassettes of the film were
already exposed to light by the MACO people. We got "pre-fogged"
films...

Eckhard

P.S.: Of course I told Mr.Schroeder from MACO about this problem. I'll
keep you informed about his answer.

-- 
========================================
*          Eckhard Stephan             * 
*          Freiburg (Germany)          *
*     eckhard.stephan@xxxxxxxxxxx      *	
*   http://www.eckhards-photobox.de    *   
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