Sticking your finger on the film while the shutter is open is risky
business, and a good way to ruin a shutter if it accidentally closes.
Instead, try taking that same film you've already ruined and load it again.
Let it sit overnight and then take off the lens and shine a light at the
film plane. Trip the shutter in the bulb position and move the light
around. Any degree of unflattness will be easy to see and will produce a
curved line reflection. Them do the same with the next shot and examine the
film flatness. You may find (as many do), that on the first shot the film
is flatter than on consequent shots. This is because the film relaxes and
flattens out as it "gets used to" it's place behind the shutter. This is a
common problem, and one that happens more on some cameras than others. It's
also more exaggerated by a larger piece of film.
Thanks,
Ed
----- Original Message -----
From: "Pål Jensen" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, February 19, 2001 5:56 PM
Subject: Re: Pentax 645 owners; Look here
> Gianfranco wrote:
>
> > I've just tested my two 645 and none of them shows any movement of the
cog
> > wheel. Only the older one seemed to show something like a VERY slight
> > vibration, more than a rotation, of the wheel before the shutter opening
the
> > first and maybe the third time I released the shutter (I've tried for
more
> > than a dozen shots a camera). The rest of the time the wheels stood
firmly
> > still during the mirror movement and the exposure.
>
>
>
> I just wasted a roll of film. It turns out that as soon as you put film in
the magazine the friction of the film makes the locking mechanism in the
film magazine immediately snap into place. Hence, the slight movement of the
cog has no influence here. Its not able to move the film.
> I also tried to touch the film plane during exposure and in all but one
frame the film was perfectly flat. However, in the one frame the film moved
slightly under my finge until it stopped against the pressure plated.
Granted, we are talking mm's here but we are anyway talking about bulging
film at the pressure plate. I cannot for the life of me figure out what
causes this...
>
> Pål
>
>
> -
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>
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