Is there any chance that the OP is mistaking a different marker for the 120 start line?
You don't need that many experiments: next time you shoot a roll, keep the backing paper and after development check, whether the arrow is in the right location. You can compare against known good film.
Measure the lenght of the film. Mybe the film is just too short and the arrows are ok?
If you still have the backing paper, measure the distance from the 'start' arrow to the leading edge of film ( not the sticky tape ).
It should be very close to 17cm.
John S
Take the backing paper from a roll of film you just developed, it should be fairly obvious where the film started. That way you can easily measure the distance between the arrow on the backing paper and the start of the film. You will see quickly, whether it's consistent across film brands.But how will I know where the film starts without sacrificing a roll? There are numbers on the backing paper which obviously correspond to frame positions, but there are many dots & other markings near the numbers. Which correponds to the start of the film strip?
Looking just at the numbers and start mark on a roll of older T-Max 100 I have on hand, I measure 24.0 cm between the start mark and the centre "1".I've just measured it and the middle "1" is 24.8 cm from the start arrow. I don't have any other backing papers on hand to compare it to though. As soon as I get a chance to develop a different film I'll see.
Can you see where the residue of the attachment tape is in relation to the "1" mark? That attachment tape should have been very close to the exact end of the film itself.
On my old T-Max 100 backing paper, that tape residue and the centre "1" are about 7.5 cm apart.
Then it sounds like the film is correctly positioned with respect to the Start mark.No residue that I can see, but there is a deformation/crease in the backing paper presumably caused by the tape, and it is between 7-8 cm from the "1", so that tallys with your results.
Then it sounds like the film is correctly positioned with respect to the Start mark.
Yes it would appear so, which is puzzling.
Now all you need to do is to measure the film length and see how it compares.
The problem could be with the thickness of the spool. In that case though, it might not fit in the camera, and the spacing between the frames would be larger than normal.
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