[rollei_list] Re: Neopan 400 in Ultrafin
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 18 Aug 2014 20:24:59 -0300
Hi Laurence:
A five leaves shutter with an oil drop affecting
two or three or four or five leaves could cause some strange effects
on the exposure. Anyway, the emulsion does not look good indeed,
perhaps you are right.
ISO 400 films are more sensitive to X rays than ISO 50 or ISO 100.
films. I lost the first three frames during a travel to Brazil in the
'90s due to X rays in the airport, I did not know at the time about
the way X rays affected the films in the airports ; it was an ISO 400
film and the X rays fogged the three first usable frames, X rays are
widely used today, including land freight transport.
Carlos
2014-08-18 18:30 GMT-03:00 Laurence Cuffe <cuffe@xxxxxxx>:
> Hi Carlos,
> I can easily see bands forming from a failing focal plane shutter, however
> looking at the pattern on the cows picture the only way I can see it
> happening from a faulty leaf shutter is if there was a pinhole from the
> centre of the focal plane shutter closing improperly, it might result in
> another image being placed on the film while the camera was resting. The "X
> shaped pattern which I see as a filled X and a Chevron of stray light on the
> film rather than increased exposure seems to be out of focus, and so I would
> be inclined to blame it on something which happened to the film out of the
> camera.
> All the best
> Laurence Cuffe
>
> Sent from QCloud
>
>
> On Aug 18, 2014, at 09:35 PM, CarlosMFreaza <cmfreaza@xxxxxxxxx> wrote:
>
> 2014-08-18 16:52 GMT-03:00 Chris Burck <chris.burck@xxxxxxxxx >:
> > Wavy streaks??? I see a very distinct geometric pattern, roughly
> equivalent
> > to. . . x‹ . I wouldn't expect something like that to result from
> chemical
> > or mechanical anomalies during processing. It seems to my mind to
> be more
> > indicative of some sort of irregularity during exposure, or
> possibly even a
> > "pre-fogging" of some sort during manufacturing.
>
> Jan:
> I tend to agree with Chris through my own experience. I had a
> similar situation with the Rollei SL66 due to uneven shutter working
> during the exposure and it was the main reason I sent it for CLA last
> year. Some shots started to show bands of different density and the
> number of shots showing the problem were increasing, the pattern were
> bands because we are talking about a focal plane shutter; the TLR has
> a leaf central shutter and it could be the cause for the distinct
> pattern, it could have to do with the shutter speed too. It looks like
> the shutter leaves don't open and don't close using the same speed.
> This is an opinion based on my experience, as I wrote above, but I
> could be wrong for your case, I don't know.
>
> Carlos
> PS: Nice shots BTW.
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