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Henry,

The monobath is a mixture of developer and fixer, pH adjusted to 9.5, that allow a film to develop and fix simultaneously. The recipe I use was concocted by Donald Qualls, and uses HC-110 US concentrate, Ilford Rapid Fixer and 5% ammonia. While this was a cheat invented to allow photojournalists to develop films in the field as easily as possible, it actually provides results that are very respectable. When it works, it produces negatives with good contrast and very little grain (the same film in HC-110 done conventionally will be much more grainy). But, and this is a big but, it is terribly prone to uneven development related to the flow of solution across the film. Early recipes for monobaths recommended continuous agitation (Crowley's FX-6a being the best known). This particular one is said to require no agitation, and that works for tray development of 4x5 or 10x8 sheet film, but if I pour it into a Paterson tank I get surge marks from the solution flowing through the sprocket holes, even if all I do is to pour it in. I can agitate afterwards but they are still there. The only way around it I can find is to use a 1950's Agfa Rondinax, which has a vertical film reel and which rolls the reel through the solution. Any surge marks should therefore be on the unused edge of the film and be aligned lengthways. So far I have discovered it works beautifully with Acros 100, quite well with Plus-X, and is a bit more prone to surge marks with faster films but I have managed to get Tri-X and Neopan 400 to work. Adox CHS25 in 120 is beautiful. Consequently I thought a slow film like Pan F would be good, but the negatives are very thin - either I should lower the temperature from 80ºF or expose the film at ISO25 instead of 50.

 

Chris

By the way, those two were taken with the F6.

Thanks Chris for the details :)

the result is nice !

I'll try it

Best

Henry

Edited by Doc Henry
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But, and this is a big but, it is terribly prone to uneven development related to the flow of solution across the film.

Thank you Chris. A dumb question perhaps, but will the risk of surge marks be reduced by mixing the solution for a long time before using it? Or is the reason that the developer and fixer don't mix well and if so would using a different combination make a difference?

 

Br

Philip

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Thank you Chris. A dumb question perhaps, but will the risk of surge marks be reduced by mixing the solution for a long time before using it? Or is the reason that the developer and fixer don't mix well and if so would using a different combination make a difference?

 

Br

Philip

 

I don't think so. I did make this stuff up as a one-shot solution until I read that the commercial form of it sells as 900ml and is good for ten films. So I made up a litre (after spending some time with pH indicator strips and a hydrometer to check the strength of the ammonia I bought at a local hardware store). This was film #7 from that litre. It's getting less contrasty as I go along. It's also necessary to filter the solution as it goes back into the stock solution to remove the silver gunk (if you don't, there will be deposits on the next film).

 

It used to be said that monobaths had to be tailored for each film, but this one seems to be fairly capable of accepting a lot of films. That's why I'm trying it out with all sorts of films to see what works and what doesn't. Just for a change, today I have some Plus-X in the M7, rated at 400; I shall develop it in Diafine.

 

Chris

Edited by chrism
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Thanks very much Chris. I look forward to the Diafine results (I'm about to mix my batch).

 

I'm occasionally attracted to minimalism. 

 

2013_137_218_9k_M4_KRE400_20_1000x667.jp

 

M4 50/2 (11817) Kentmere 400 HC-110:B (but I don't know the time)

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Guest Benqui

This is for Adam:

not the beach in Florida but a building yard at Lago di Garda, Italy which is used as a beach by only two persons

 

best regards

 

Marc

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Two more from last week in Chicago.

M7, Summicron-M 35/2, Tri-X400@1660, Semi stand dev in R09

 

 

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Still Chicago… "the solo man dinner"

 

M7, Summicron-M 35/2, Tri-X400@1660, Semi stand dev in R09

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Edited by MaDeVa
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Back in Turin

but still the same roll… M7, Elmar-C 90/4, Tri-X400@1660, Semi stand dev in R09

 

 

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Turin, the new San Paolo Bank building

M7, Elmar-C 90/4, Tri-X400@1660, Semi stand dev in R09

 

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Very nice morning fog Cuthbert in color

Best

Henry

 

Actually it was evening, or better 3PM but at wintertime the sun sets quickly, and I also assume pollution plays a part in it, here there's a similar shot I've taken with the M3:

 

 

x4oty1.jpg

 

I hope I haven't posted them already in this thread, however if you want fog or smog Northern Italy is the place for you:

 

zv4w11.jpg

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Nice b&w page here specially Massimo, Philip, Brendan (stunning picture)

Thanks all :)

 

 

In a outdoors US plane cemetery.

Aircraft model ?

 

 

"Fuddy Duddy"

 

Kodak T400 - MP - 50 Cron

 

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Best

Henry

Edited by Doc Henry
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