Strange Film

polyglot said:

No it's clearly been developed OK, you can see "400TX" in the edges. I agree with the crinkling theory because the densest stress-fog lines are at the corners of the sprockets, which means the film has had some seriously tight bending applied to it.

Note that you can get stress fog without the film looking crinkled. Just bend the film real tight and release it; the backing won't show a fold but the emulsion will be fogged there.

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If that's the case, perhaps the students tried to rewind the film into the cassette without releasing the rewind button (assuming an all- manual camera), over-tightening it. I've never had this problem either - very odd!

Cheers,
kevs

^^^ No, that would just rip out all the sprocket holes.

^agree as I have had this happen to me too, I thought the release button was depressed correctly and whilst rewinding it broke the film in half.

Here is some suspense for you all, I bulk loaded a roll of 10 frames, shot it tonight, reverse rewinded it and it is in the wash now.....we shall see.....5 mins left on the wash....

zsas... Did you rewind the film backwards into the cassette?

Yep.....T minus 2 mins...

Ya' gotta love scientific methodology.

I did a test to see if I could replicate the striations:
Bulk loaded (normally) 10 or so frames of Tmax 400
-Shot it at 800 on an Olympus XA
-Winded backward, the direction of the red arrow below:

-Loaded on a steel reel in darkness, the normal way, I unrolled it and rolled it normally on the reel
-Xtol 1:1, 14:15mins, yeah I cooked the film a little bit, but I had some HP5+ to do in the same tank that needed 14:15, wasn't wasn’t going to do a separate run for this film (Tmax 400 at 800). The suggested time wd have been 9:30 but it still came out acceptable:


I took a photo of the neg as it dry, the background is noisy, I know, far from ideal, but you see what I see. I dont see the striations that we saw from the OPs example, but who knows, my camera, when rewound backwards, could be more gentle? I agree those striations the OP sees could be from reverse winding, but I am still questioning how on earth the latent image wd have been taken away too? Think there were double issues? I do see some edge damage on my example. I am going to say my test was inconclusive…

EDIT: adding neg scan

^Now that's dedication! Thanks for the experiment!
I agree that there are probably several factors involved in the issue. I was baffled, not only by the striped pattern, but also by the fact that two students both had the same problem with no latent image under the striations.

I have an old box brownie six-20 (my mums) that I occasionly put a roll of 120 through... to do this I need to file off the edges of the 120 spool otherwise it's too hard to wind through the camera and I end up with stress marks, however they are never this consistant or 'bad' (probably as the pressure point the 120 spool causes as it rotates might only be at one point).

To reverse roll a 35mm cassette are people suggesting the user has got to the end of the roll, hit the rewind release and then continued to wind the crank handle the 'incorrect' way so that the film comes back into the cassette and makes a hard turn around the light trap rather then the smooth path it's supposed to take? Just wondering how this could happen, I've never tried it

We need a "scratching head in confusion" smiley.

I'm going to go with reverse rewinding as well. When I was 9-10 and shooting with my dad's XG-M, I accidentally rewound the film backwards, and it had similar marks. I'd show you a scan, but unfortunately, the negs are not here with me.

^Were there stress marks on the film and images or blank images with the stress marks only?

Btw, when I did the above test, it was extremely hard to reverse wind my film, there was a massive amount of pressure on the film and rewind mechanism, to the point I was worried it would snap (thankfully it didn't). I would not recommend reverse winding to anyone, I did it bc I have a parts camera laying around and figured I would do the experiment above....

zsas said:

^Were there stress marks on the film and images or blank images with the stress marks only?

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Stress marks and images. I think it may have to do with the exact rewind mechanism (what is metal and what isn't) whether you get the marks or not.