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20×24
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Does anyone here print 20×24 (or bigger) ?
How?
I’ve come up with a design for a processing system for film or paper,
based on the rotary tube model-
It’d take much less space than trays,
and should use much less chemistry-However, it would be more economical for me to make multiples of it-
materials are expensive-Would anyone be interested, for about a hundred quid a kit?
Martin? Mark? Fizz? Fintan? Anyone?
If it’s not a good Idea, say so…
Mark mentioned, a while ago, that he didn’t have the space for all the trays for 16×20-
my system will allow processing 20×24’s in much the same space as one 16×20 tray-Any interest?
Could be interested. At the moment, I’m working in cramped quarters, when it comes to printing. Had thought vertical trays would be the solution, but oddly they seem rarer than hens teeth. What would your solution entail?
Damien
em, rotary-
can’t say too much, it’s a little bit novel-
but very simple. And elegant, if I say so myself-I’d be using it for film, paper, cibachrome-
I’ve been using a similar system for processing 8×10 C41,
so I’m pretty sure it works-If I can get a few people interested, I’d go ahead with it sooner, rather than later-
Id like to try to print something 20×24 or larger some day but at the moment im a 9.5×12 inch person. Any larger would be to expensive for me paper wise
I think when you get to around 30inchs people start to have problems and need a 2nd person to help. If you could come up with something that would make printing at this size easier people would listen I think around the globe
Have fun, hope you go ahead with it as would be interested to see what you come up with
M
You’ll have to forgive me, not so up to speed on all these doo-hickeys :)
Do you mean you it would be temperature controlled ? Would be quite interested from a C-41 processing & printing point of view, as well as b&w printing if it could help with the cramped space issue I have for the near future.
Got any pics/ links of what we would be talking about ? Not too lazy to google, just with my limited knowledge re: rotary processors, I could do myself an injury if let loose near a search engine :)
Damien
No, no links-
This particular thing doesn’t exist yet-Rotary processors are quite common- Jobo is the most visible brand-
Yes, it could use a temperature controlled water jacket,
for temperature critical processes-
but it wouldn’t include the water jacket itself.However, a single 20×24 tray could contain the whole process.
Unfortunately, a 16×20 tray is just about an inch too short.
Processing 20×24’s conventionally in trays, for dev, stop, fix and wash, would obviously take up four times as much space…If you’re just processing C41 roll film, then it wouldn’t make much sense-
This would be more appropriate for sheet material-Larger or smaller sheet sizes could be accommodated too, let me know what the requirements would be…
I echo Martins sentiments, would be an 8×10/ 9.5×12 person myself too
Can’t beat trays at that size…
Printing 20×24 would be once in a blue moon for me plus I have enough space in my darkroom if I did want to print that size. I do think its a good idea so best of luck with it Joseph.
I have 20×24 trays JB so wouldnt be interested. I’ve made 20×20 prints, chemical cost wasnt as high as you would think and the prints developed evenly.
Thanks for the replies-
True, the costs to fill up big trays for b&w wouldn’t be exorbitant,
but you could easily spend £45 in one go using Ilfochrome chemicals.A 20×24 tray has a large surface area for oxidation,
and in the case of the Ilfochrome, a large surface area for the evaporation of some pretty noxious substances.The case for not using trays is a strong one-
repeatable processes, with the last print of a session receiving exactly the same dev and fix as the first-
perhaps important, considering the cumulative cost of materials-However, for some processes, this wouldn’t be as critical-
and there may be a benefit in being able to develop by inspection-
Anyway- seems like the point is moot…Thanks again-
Yea it would make more sense with Ilfochrome chems but you will often hear of uneven development in large tanks like that so you might be throwing out paper to save chemicals. If I was looking to make economies I would be thinking of making a large slot processor not a rotary tank.
Fintan wrote:
you will often hear of uneven development in large tanks like that so you might be throwing out paper to save chemicals. If I was looking to make economies I would be thinking of making a large slot processor not a rotary tank.
I haven’t heard that-
I can only go by my own experience, and the most successful method I’ve used to develop large sheets has been using a rotary method.
I’ve developed sheets up to 20×16 in trays, 20×16 trays,
and there are problems with uneven development.
Agitation patterns are set up so that the reflections of the waves of liquid off the walls of the tray causes increased contrast around the edges.While this is my experience with film, I’ve heard the same problem discussed in relation to infectious development print processes, such as Lith, where it’s recommended to use trays much larger than the paper size.
This would become absolutely unfeasible for 20×24 or larger, without access to a very large space, and much more chemistry than is necessary.Slot processing would be another option, though my system might be much more elegant and economical.
So I haven’t even considered it-
I never mentioned a tank…Sorry of I sounded like I was picking at your idea JB good luck with your project, I look forward to seeing it.
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