Compression Fogging

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Alan Smithee - 07 Nov 2005 02:21 GMT

What's compression fogging? What's it look like? How's it caused? Is it real
or imagined? I know "someone" who had a roll come back junked and the lab.
The lab claimed it was compression fogging. Yes, the camera hand rewind (an
M3).

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Michael Gudzinowicz - 07 Nov 2005 02:43 GMT

> What's compression fogging? What's it look like? How's it caused? Is it real
> or imagined? I know "someone" who had a roll come back junked and the lab.
> The lab claimed it was compression fogging. Yes, the camera hand rewind (an
> M3).

If you fold undeveloped film, the pressure on the emulsion may fog the
area which has been damaged. Generally that only happens with thin base
films if they are bent or crinkled when being loaded onto reels for
processing. The damaged area usually resembles small crescents, about
1/8" to 1/4" long.

Mike.

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Alan Smithee - 07 Nov 2005 22:29 GMT

> > What's compression fogging? What's it look like? How's it caused? Is it real
> > or imagined? I know "someone" who had a roll come back junked and the lab.
[quoted text clipped - 6 lines]
> processing. The damaged area usually resembles small crescents, about
> 1/8" to 1/4" long.

I think what happened was the film knob was momentarily turned the wrong way
during the rewind causing a "z" kink. The film was then rewound the correct
way but the pressure from the canister caused the fog. At least that was
what the lab offered as an explanation.

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