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Sprocket holes - clipping frame


aauckland

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Ironically (I think), experience with M3s has taught me to be more careful with the film engaging the drive better (so that the sprocket holes are actually being grabbed by the sprocket -- in the M, missing that can result in double exposures as the drive rattles past the holes, not moving the film forward properly). Thus, I really haven't had this problem with the III since, because I've become hyper-careful about film placement...

 

Time consuming, though, and occasionally frustrating...

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  • 2 years later...
Personally, I love seeing photos were sprockets are intruding into the image.

 

Hi Iver

 

Yes

 

The problem is the cassette chambre in Barnacks is 2mm longer taen the 1933 DIN for cassettes. The DIN was sponsored by Kodak (e.g. DrNagel) for Retinas, and Leicas were built different..

 

The FILCA Barnack relodable cassettes are (were) 2mm longer then the standard, so they wont slip down.

 

The IXMOO (for M cameras) are to the DIN and can move down in Barnacks, but are usable in Barnacks, the FILCAs wont fit in Ms, the baseplate wont close. Dont ask how I know this....

 

Part way through IIIf production they included a finger in the baeplate to locate the film, the cassette 'dangles' from the film.

 

Normally the film rails will hold the cassette in place, Never had it happen with my IIICs or IIf

 

Noel

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Very interesting Noel,

When Leica added the "Finger" to the IIIf production, they were probably fully aware of this issue. The design decision to go with the "finger", (not an ideal solution which allows the film cassette to dangle, and put more load on the film edge,) was to, maybe, still allow the re-loadable cassettes to fit correctly.

 

The aesthetic preference for the clipping to be seen "within the Frame", is interesting since we are talking about a sprocket hole intrusion into the frame because of a faulty positioned film. Personally, I like to see a full negative printed, which could even include sprocket holes within the black border, (but never intruding within the image actual frame area.)

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Pre-Solms wide angle lenses being close to the film plane can exacerbate the issue by encroaching into the sprocket area.

John.

They do as do J12 - a lot, and wide CV LTM (less so).

But I never have a problem, I think the rails will hold the film & a cassette, in position. I always cut a ABLON style leader, and locate the cassette, against the rewind forks, , and tighten the film counter holidng the film on sproket tooth, my last finger is small enough. .

Very interesting Noel,

When Leica added the "Finger" to the IIIf production, they were probably fully aware of this issue. The design decision to go with the "finger", (not an ideal solution which allows the film cassette to dangle, and put more load on the film edge,) was to, maybe, still allow the re-loadable cassettes to fit correctly.

 

The aesthetic preference for the clipping to be seen "within the Frame", is interesting since we are talking about a sprocket hole intrusion into the frame because of a faulty positioned film. Personally, I like to see a full negative printed, which could even include sprocket holes within the black border, (but never intruding within the image actual frame area.)

I had not thought of the FILCA compatibility, that is true.

Changing the casting (more) or baseplate latch would have been more expensive, And FILCA users upgrading to new body would have needed to trade in their FILCAs for IXMOO. Which I think were available.

 

Noel

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  • 4 weeks later...

On the early Leica II's and III's the easiest way to fix the problem is to unscrew the small black screw in the centre of locking ring on the inside of the baseplate and reverse the small black washer that lies below the screw and then re-insert the screw into the washer and re-tighten.This raises the washer slightly, which then raises the film cassette when it is inserted in the camera and the baseplate is locked.This usually corrects the problem of the sprocket holes appearing on the film without having to insert any paper packing.

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