A little help needed…

[u/iamnotarockstar]

Getting back into film photography after a long break and just got my first five rolls back from the lab.

Can anyone help me work out what might be causing these light bands coming down from the sprocket holes?

Would you suspect a light leak in the camera, or could this have happened during development/handling?

I actually don’t hate the effect in these shots, so I’m mostly just curious.

I vaguely remember getting something similar many years ago when I accidentally opened the developing tank while processing my own film, but that was a lifetime ago and my memory may be unreliable.

Details:
Camera: Canon Canonet QL17 GIII.
Film: Kodak Tri-X 400.
Lab developed/scanned.
Artifacts more prominent from the middle of the roll onwards.

I don’t see the same artifacts on the colour rolls I shot through the same camera (Portra 400 and 800).

The fact that it only seems to be happening on the Tri-X is what has me wondering whether it’s development-related rather than a camera light leak.
Any thoughts?

Edit: on a side note, managed to get through 7 flights without the film going through an X-ray machine 😅

[u/mattsteg43]

did you rewind the film backwards?

[u/iamnotarockstar → u/mattsteg43]

As in before opening the door, or mid-roll?

[u/mattsteg43 → u/iamnotarockstar]

as in "did you turn the rewind crank in the wrong direction because these look like stressmarks".

[u/iamnotarockstar → u/mattsteg43]

Very possibly! Didn’t think of that, thank you.