RE: Re. [Leica] Frame #31 uneven (pictures)

["Saganich, Christopher/Medical Physics" <saganicc@MSKCC.ORG>]

Looks like a machine problem rather then a camera problem.

Chris Saganich


- -----Original Message-----
From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us] On Behalf Of Peter Klein
Sent: Tuesday, November 25, 2003 12:12 AM
To: leica-users@mejac.palo-alto.ca.us
Subject: Re. [Leica] Frame #31 uneven (pictures)

Here are the pictures.  They are titled "ShutterProb" only because that's 
what I initially thought the issue was.

http://www2.2alpha.com/~pklein/tofino/1-31ShutterProb.jpg
http://www2.2alpha.com/~pklein/tofino/2-31ShutterProb.jpg
http://www2.2alpha.com/~pklein/tofino/3-31ShutterProb.jpg

- --Peter

At 03:02 PM 11/24/03 -0800, I wrote:

>Folks: Simon's drying marks on his negs reminded me of a mysterious
>problem I had recently.  It happened on three successive rolls of color
>neg film (1 of Supra 400, two of Reala 100), all shot in the same M6TTL,
>and processed together at the same lab.
>
>On each roll, on frame #31 and *only* frame #31, the right half
>(approximately) of each print was significantly darker than the left half,
>with a distinct boundary. The brighter half (left) looked correctly
>exposed, the darker half (right) looked underexposed. The boundary between
>the bright and dark areas was a vertical line, not exactly straight, but
>nearly so.  All three defective frames were probably *not* taken at the
>same shutter speed, which could have been anywhere between 1/60 and 1/500.
>The unevenness appears on the negatives, too.
>
>I suspected a shutter problem.  But when I talked to Sherry about it, she
>said that she didn't see how such a thing could be related to a frame
>number.  If all or most pictures taken at a particular shutter speed were
>uneven, that would indicate a shutter problem.
>
>Since then I've shot several rolls, and the problem has not recurred.
>I've used both the lab where the three problem rolls were developed, and
>another.  No more uneven frames.
>
>I'm beginning to wonder if the processing is at fault. The only three
>things in common are the camera, the lab, and the time of processing.


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