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12-09-2019, 02:51 PM   #1
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Pentax 645N: Frame advance does not stop at 16, will keep advancing to frame 19

I'm on my 4th or 5th Pentax 645N, this one I bought recently at a local camera store. I've noticed two issues with it.

1. It tends to slightly over expose on any auto setting, but fine if I use a handheld meter. So I can live with this.

2. With a loaded roll of 120, it will shoot beyond frame 16 and stop at frame 19. Meaning I've lost three images that I thought I had. I've been able to shoot the camera reliably for 6 or 7 rolls if I watch the frame counter. Spacing seems slightly further down the roll for frame 1 than other 645N - but it is consistent.

I used a known good 120 insert from in this camera and same issue, goes past frame 16 to frame 19. The suspect 120 insert also works fine in a known good body, so it's not the insert.

Anyone had issues with these going past frame 16 with a 120 insert installed? Bigger problems looming or shoot it till it dies?

Thanks in advance.


Last edited by Lanline; 12-09-2019 at 02:55 PM. Reason: more info
12-10-2019, 06:43 AM   #2
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I have a 645N. I seem to recall that the film leader length differs between brands eg ilford vs Kodak and it can result in a frame or two different, however not 3 frames.

What film arre you using?
Do you get 19 images on the film once developed?
12-10-2019, 07:12 PM   #3
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QuoteOriginally posted by ProfessorBuzz Quote
I have a 645N. I seem to recall that the film leader length differs between brands eg ilford vs Kodak and it can result in a frame or two different, however not 3 frames.

What film arre you using?
Do you get 19 images on the film once developed?
TMAX & HP5 - these are perfect in the other PENTAX 645N with 120 insert, 16 frames.

The new 645N with included 120 insert or known good 120 insert 15.5 frames and the camera doesn't stop at frame 16. So if I don't pay attention to the counter, the camera keeps shooting as if there is film not done, eventually stopping at frame 19.
09-30-2020, 06:26 AM   #4
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I have this exact problem. Mine advances to 22 before winding up, so I have to manually finish the roll at frame 17 to make sure I donít take any photos that are blank.

I have a thread about this on here and people thought I was crazy. I donít have a solution for your problem though, sorry!

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