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

Subject: Re: [OM] 612 film back advice is needed.
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 21 Aug 2010 07:43:51 -0400
I would assert that the only way your film back can cause a problem is 
to leak light.  I didn't see anything that looked to me like a light leak.

Chuck Norcutt


Michael Wong wrote:
> 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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