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Charles Bridge, Prague. West Gate
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Rob Archer



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Registered: September 2008
Location: Kings Lynn, Norfolk - flatlands and big skies.
Posts: 1,071
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This print shows an uneven tone in the sky. You can see verticals trips. They are on the negative. I have found it with odd films (not the same brand/type/speed). I'm not sure whether it's a light leak or a developing problem. It only shows up on a plain sky such as this. They are 6 x 4.5 negs made on a Bronica ETRSi.


Any ideas how I should go about identifying the problem and fixing it?
Date: Sat, 6, February, 2010 Views: 4484
Filesize: 201.3kb, 75.7kb Dimensions: 614 x 480
Additional Info
Keywords: Charles Bridge, Prague. West Gate
Film make, size & rating:: Delta 400 , 120
Film developer & temp:: ID11 1+1
Lens focal length, aperture & speed:: 150mm
Tripod used Y/N:: Monopod
Paper:: Kentmere Bromide
Paper developer & temp:: Beers 2-Bath

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Sat, 6, February, 2010 9:30pm

As it's 6x4.5 film am I right in thinking that they run the length of the film, rather than across?
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Rob Archer

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Registered: September 2008
Location: Kings Lynn, Norfolk - flatlands and big skies.
Posts: 1,071
Sat, 6, February, 2010 9:36pm

Yes, Dave. They run along the film. If they were across I would suspect 'bromide drag'. Definately not the problem here as I didn't use stand development, either.


Rob
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Sun, 7, February, 2010 8:17am

As you say that would seem to rule out any form of developer flow markings. Are you able to tie it down to any one film back?
It seems that it is more lightly to be a light leak problem, but I would have expected to see the mark more pronounced where the film was stationary if that were the case.
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Richard Gould
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Registered: December 2008
Location: Jersey Channel Islands
Posts: 4,908
Sun, 7, February, 2010 2:24pm

If it was a light leak it would surely be more pronounced so I can't see it being that,so I would guess it is some form of chemical problem,but what I could'nt say,Richard

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jerseyinblackandwhite.blogspot.com
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B&W Neil

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Registered: October 2008
Location: West Cornwall
Posts: 4,000
Sun, 7, February, 2010 5:49pm

Does this only happen with this Bronica / back combination ? If so it points to the camera / back. The only other thing I can think of is the backing paper on the film roll may have been loose and under a bright room light some light ingress could happen. But normally this would only affect the negs at the start of the roll.


Neil.

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"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch - mono-inthedark.co.uk
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Bill

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Registered: September 2008
Location: Barrow - in - Furness
Posts: 1,650
Mon, 8, February, 2010 8:20am

Is it possible that rotational agitation could have caused this or do you invert?


Bill
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Richard Gould
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Registered: December 2008
Location: Jersey Channel Islands
Posts: 4,908
Tue, 16, February, 2010 7:37pm

I had the same thing on a print this morning, nothing on the negative, checked it on the light box and clean, negative was from a rolleiflex negative. I re-printed it using the same paper,dev etc.only the second time I put the paper in the devolper emulsion side up, and the lines were not there, nice print, so I can only conclude that something went wrong with putting the print in the tray emulsion side down to start then turning it over, it was on fb paper,Fomatone,and had not happened before,Richard

------------------------------
jerseyinblackandwhite.blogspot.com
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DavidH
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Registered: May 2010
Location: Dengie Peninsula
Posts: 432
Fri, 14, May, 2010 10:05am

I just wondered if you have tried printing this negative on paper from a different box. Some years back, I had a box of paper that gave a problem rather like this. The fault would only be noticeable in areas of mid tone and not in parts of the picture with more detail and contrast. I confirmed the problem by trying the same negatives on a different batch of paper. When I took it back to the dealer, I found that the film and paper were displayed on shelves directly above a radiator!
I have always found it best to put paper in the developer emulsion side up to avoid trapping air, and of course agitation is important.
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John Edwards
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Registered: July 2010
Location: Nuneaton, West Midlands
Posts: 4
Fri, 6, August, 2010 12:17am

I had a similar problem in the past and I tracked it down to agitating using rotation in Patterson tanks (using the agitation stick - if that's the correct term). Ever since I have agitated by inversion and touch wood I've not experienced anything like it since.
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Graeme

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Registered: February 2010
Location: Sunderland, UK
Posts: 350
Sat, 14, August, 2010 2:27pm

Hi - agree about the tanks, had marks running top to bottom on negs through inverting too quickly in Patterson tanks - impatient b****r that I am.

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Best Wishes, Graeme http://graemestarkphotography.blogspot.com/
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Rob Archer

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Registered: September 2008
Location: Kings Lynn, Norfolk - flatlands and big skies.
Posts: 1,071
Thu, 19, August, 2010 10:19pm

I've finally tracked the problem down! It is the film back. There was a burr of metal about 1/3 of the way across the lower slot where the dark slide sits, meaning it wasn't sitting evenly. I noticed it was stiff to slide in and our but hadn't made the connection. I had noticed it only affected negatives where the film had been in the camera a while between exposures. I've managed to remove it with a sharp knife. I left an old iso400 film in the back in full sun for several hours, and developed it for twice the recommended time to boost contrast and it's fine - so I guess problem sorted!
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