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  #11  
Old 20th January 2020, 05:34 PM
Richard Gould Richard Gould is offline
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Quote:
Originally Posted by KeithM View Post
I noticed a change in spacing when I switched from Acros 100 to Fomapan 100, which is noticeably thinner than Acros. Spacing with Fomapan is circa 2mm wider.
Certainly I too gave found hat with Fomapan 400, the spacing was wider than with Ilford films in my Rollei's and also in my ETRSI's, but when Foma changed backing papers a year or so ago to the same as Ilford/Kodak Ect from a thicker backing paper the spacing in all of my Rollei's/Microcord's and Etrsi the spacing became more on a par with Ilford/Kodak, I can't say with Across as I have never used it,but the backing paper thickness does affect the spacing, but should not cause a problrem with spacing being to close, at least not with Foma/Ilford/Kodak.at least when using my50 plus year old TLR'S,
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  #12  
Old 21st January 2020, 10:25 AM
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CambsIan CambsIan is offline
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I have a Kiev 60, a wonderful clunky, shiny, brick of a camera, which has this problem, pretty much built into it at the factory.

There is a trick to loading that will mostly sort it, but as I cant always get it quite right. I have created a couple of spools where I have wrapped a short length of film around the centre of the spool to alter the amount the film travels per spool rotation, just to increase the spacing per frame.

A bit of a bodge job, but does the trick.

Funny old things cameras aren't they

Ian
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  #13  
Old 21st January 2020, 10:54 AM
alexmuir alexmuir is offline
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Default Lack of separation of frames using 120 film

I’m sure film and paper thickness can make a difference. I remember trying to load some Agfa colour film in a Lubitel TLR. It was a struggle to wind the film on, due to either the film, or paper being very thick. I seem to recall that XP2 was also thicker than normal B&W films.
Alex


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  #14  
Old 21st January 2020, 10:32 PM
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johnmargetts johnmargetts is offline
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Spool size will not and can not make any difference. The effective spool diameter increases as film is wound on to the take-up spool or decreases as the film is wound off the film spool. If the frame spacing was controlled by the number of turns of the spool, the frame spacing would change considerably from the start to the end of the film.

Most (all?) medium format cameras measure the amount of film by the number of rotations of a roller. So long as the roller is rotating properly, frame spacing will be correct.

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  #15  
Old 22nd January 2020, 12:13 AM
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Originally Posted by johnmargetts View Post
Spool size will not and can not make any difference. The effective spool diameter increases as film is wound on to the take-up spool or decreases as the film is wound off the film spool. If the frame spacing was controlled by the number of turns of the spool, the frame spacing would change considerably from the start to the end of the film.

Most (all?) medium format cameras measure the amount of film by the number of rotations of a roller. So long as the roller is rotating properly, frame spacing will be correct.

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Spool size can and does make a difference. I’ve proved it to myself using my Zeiss Super Ikonta IV. You can read about it here:

http://zeisscamera.com/articles_spacing.shtml


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  #16  
Old 23rd January 2020, 02:38 AM
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Martin Aislabie Martin Aislabie is online now
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Quote:
Originally Posted by johnmargetts View Post
Spool size will not and can not make any difference. The effective spool diameter increases as film is wound on to the take-up spool or decreases as the film is wound off the film spool. If the frame spacing was controlled by the number of turns of the spool, the frame spacing would change considerably from the start to the end of the film.

Most (all?) medium format cameras measure the amount of film by the number of rotations of a roller. So long as the roller is rotating properly, frame spacing will be correct.

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Spool diameter does make a difference.

Camera manufacturers built in a mechanism to adjust the amount of film wound on as the film progressed through the roll.

The mechanism is tricky to design but assumed it knew the thickness of a film - change the film thickness and/or the backing paper and the whole adjustment trick goes out of the window.

Think about it - if you consider the diameter of a roll of either 35mm or 120 - at the start of the film the advancing roll is small - but easily more than double by the end.
If the camera only allowed a constant ?? turns each time - the film spaces would small at the start and more than double at the end.

I think Leica solved the problem first - in the 1930s - and everyone else followed suit (camera historians feel free to correct me)

Martin
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