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Re: [OM] 612 film back advice is needed.

Subject: Re: [OM] 612 film back advice is needed.
From: Michael Wong <mialop@xxxxxxxxxxxx>
Date: Sat, 21 Aug 2010 18:19:06 +0800
The procedure is same as to take 4x5 shots except put different film back on
my machine. After the shot of 612, I put the dark slide into film back and
rotate the knob for film advance & then put my 612 film back away from my
machine. I do similar procedure for my 4x5 shots but no problem at all.
Moreover, I took both 4x5 shots & 612 shots that day but 4x5 shots are no
problem.

I do not think my procedure, my machine, my lens has error to cause the
color shifting error since the problem didn't appear on 4x5 shots. Is it
film problem? Development error? Or film back problem?


---
Michael



On 21 August 2010 03:30, Jeff Keller <om-list@xxxxxxxxxxx> wrote:

> Yes, it also looks to me that the images he posted had the problem
> "centered" on two adjacent images. He said it was a recurring problem but
> if
> it ALWAYS shows up on adjacent frames, it would seem someone is much more
> consistent in what they are doing than I would expect.
>
> The film back has a darkslide which must be pulled out to expose the film.
> Typically the Chinese made backs use a knob to advance the film until the
> next exposure number printed on the back of the film appears in a small red
> window on the film back. If the dark slide were pulled out when the film
> was
> half advanced it would be possible to partially expose two adjacent frames.
>
> He said that he had color shifts constantly (but maybe not in the same
> locations). It's hard to imagine any kind of strictly operator error that
> would cause it. If his equipment was faulty, maybe his standard procedure
> causes the problem to recur.
>
> Jeff
>
> -----Original Message-----
> From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
> Sent: Friday, August 20, 2010 7:34 AM
> To: Olympus Camera Discussion
> Subject: Re: [OM] 612 film back advice is needed.
>
> I have no idea how roll film is commercially developed.  I was
> hypothesizing the roll being drawn through the chemicals and getting
> stuck in one place too long.  Totally in my head and without any facts
> to support me.  Regardless, some sort of processing error seems much
> more real to me than two adjacent images sharing a common defect that is
> visible only on about 1/3 of each image and those areas being adjacent
> to each other.  What in the camera causes a flaw to appear on the right
> third of an image and in the next frame to appear on the left side?
>
> So far no one has even commented that they see this adjacent image
> problem.  Am I imagining it?
>
> Chuck Norcutt
>
>
> Bill Pearce wrote:
> > Those sorts of flaws, where it's not consistently across the entire roll,
> > are rarely a processing error. Color shifts in the image from side to
> side?
> > How can that be a processing error. The only thing I've ever seen in
> years
> > of processing would be a light strike in a machine, but those are very
> very
> > rare these days, unless you are having film processed at a drugstore or
> > somewhere like that.
> >
> > Bill Pearce
> >
> > -----Original Message-----
> > From: Chuck Norcutt [mailto:chucknorcutt@xxxxxxxxxxxxxxxx]
> > Sent: Friday, August 20, 2010 7:29 AM
> > To: Olympus Camera Discussion
> > Subject: Re: [OM] 612 film back advice is needed.
> >
> > I haven't seen anyone comment yet on my diagnosis of a film processing
> > error.  The was predicated on two successive and supposedly adjacent
> images
> > showing the same failure... one on the right side and the other on the
> left.
> > The implication is that, whatever the cause, it crossed over two adjacent
> > images.  If it happened in-camera it would seem that the film would have
> had
> > to be advanced a half frame and allowed to sit there for a while.  But
> since
> > there's a color defect involved all I can suppose is processing.
> >
> > Chuck Norcutt
> >
> >
> > Brian Swale wrote:
> >> I've missed a couple of digests so may be behind in ideas on this topic.
> >>
> >> But it occurred to me that after the first shot on a new roll of film,
> >> the 6 x 12 back could be removed, rotated 180 degrees, and used for the
> > second shot.
> >> Take note of which end was where on the body, each time.
> >>
> >> Do that for all images and see what pattern (if any) of colour defect
> >> shows up.
> >>
> >> Brian Swale.
>
>
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