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08-14-2022, 07:57 AM   #1
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220 holder finishes after 16 exposures only


I just ran the first time a 220 film through my 645n, before only 120 films in the 120 holder. For the 220 I used of course the 220 holder, but after exposure 16 I was surprised of a fast forward to end.

What could be possible reasons? Someone converted it to 120 or something stuck on holder or camera?

The film is still in the camera. I think it wound longer then with 120 film, but are not sure. I guess the first steps are:

Opening the holder in a dark changing bag to see if the film is completely wound. If it is, taking it out. If not, I could place the holder in its case which should be light tight.

Which part of the camera should I check, and what of the holder?

The film isn't the most important, but still using it to end would be great once I have figured out the problem. I guess I would need to rewind it back to the starting spool really tight (in the holder maybe?), So I can expose it in the camera in the dark again to 17? Otherwise I can of course just develop it and waist the half...

08-14-2022, 08:20 AM   #2

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Get an extra roll for practice. Winding exposed film back and forth is a pain to say the least - but itís possible. The extra roll allows you to play and find out what went wrong.
08-14-2022, 09:52 AM   #3
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Somewhere on this forum is a long thread about converting 220 backs to 120 backs. Using that you may be able to check whether any of the suggested conversion steps were taken.
08-14-2022, 10:12 AM   #4
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Isn't there a switch that needs to be moved from 120 to 220 to set the camera up for the longer roll?

08-15-2022, 07:46 AM   #5
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QuoteOriginally posted by Wheatfield Quote
Isn't there a switch that needs to be moved from 120 to 220 to set the camera up for the longer roll?
I recall that also, but don't have any 220 backs so I never looked into using one in detail other than the physical modifications to the backs that were being discussed. The switch should be addressed in the user guide for the 645N.
08-15-2022, 09:08 AM   #6
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A 220 back can be set to 120 films so 16 frames. Online you will see the small tab you have to flip to make it 120 and that would need to be flipped back to the 220 settings.

Not hard to do. Many 220 backs have been flipped to 120.

08-15-2022, 06:39 PM   #7
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Thanks, I found videos showing the conversion. Likely I'll find Wednesday the time to get the holder in a changing bag out to check the film and the tab on the holder. Moving it back in case it is reversed looks easy. In case it is correct, there might be the button who gets pushed in the camera stuck, I'll see... I have a 120 holder and a 645 to compare.

08-17-2022, 09:45 AM   #8
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Finally took the film holder out in a changing bag. The bag wasn't needed for now, since the film is completely wound to the end.

And: The holder was indeed converted, the tab pokes up as it should be for the 120 holder (see here 120 film using a 220 back - 645N - Page 2 - ). So an easy fix...

Now I only have to debate with myself if I can manage to rewind the 220 film or just develop it...

---------- Post added 08-17-22 at 10:25 AM ----------

And now: Success! Following some respooling to 620 format videos (but ignoring of course the first half), I was able to spool it back to start. Bit sweaty in the changing bag, but doable. Result was nice and tight rolled so should be ok I guess. Back in the camera after un-converting the holder back to 220 format, and the camera counter went through to 17 (of course, again in the dark). So I can use the second half of the roll now.

Thanks everyone!

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