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#1
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Tomas Daniska wrote:
OK, asked this in some thread but probably was way too off-topic here. Basically - do you develop your papers always for a fixed time or not? Yes: fixed time -- most of the time. If fixed - what time do you use? I find Ilford's paper documentation a bit confusing on this - in the same datasheet (for MG IV RC) they once say 60s @20C (in the general process overview) and a few paragraphs later they specify 46s @20C (in the detailed time vs. temperature breakout table). 2 minutes using D-72 1+2. 3 minutes when using Ansco 113 (Amidol) developer. If development was meant to be processed until the end of the process, this could be OK (maybe they added some safety in the first barebone overview). But to my understanding, only stop and fix are done this way, development is meant to be performed to some *exact* stage. Film is done until you get the desired contrast index. Paper is done "to completion." But that is not quite true: if you leave the paper in the developer for an hour or so (I have not tried this), it will turn black even if the safelights are off; You gotta be reasonable. But once paper is developped "enough" it will only get darker by developping longer. I sometimes do that if I slightly underexposed a sheet, but if I am off by much, that is not good enough, and I just make another. Can anyone shine a little light on this for me please? Maybe a sentence or two on whether temperature variations have any impact on development except different timing? They probably do, but my temperatures do not vary much because my temperature control valve supplies controlled water to the print washer, and that overflows into my washing sink that, in turn, overflows into my processing sink. If either of those sinks gets too deep, the water overflows down the drain. Normally it is the processing sink that does that. If this may have some impact on the recommendations - I have a tray processor with tempered and temp-stabilized water bath. Thanks so far -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 17:35:00 up 11 days, 6:54, 4 users, load average: 4.47, 7.86, 10.10 |
#2
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Developing paper - always for a fixed time or not?
Tomas Daniska wrote: OK, asked this in some thread but probably was way too off-topic here. Basically - do you develop your papers always for a fixed time or not? If fixed - what time do you use? I find Ilford's paper documentation a bit confusing on this - in the same datasheet (for MG IV RC) they once say 60s @20C (in the general process overview) and a few paragraphs later they specify 46s @20C (in the detailed time vs. temperature breakout table). If development was meant to be processed until the end of the process, this could be OK (maybe they added some safety in the first barebone overview). But to my understanding, only stop and fix are done this way, development is meant to be performed to some *exact* stage. Can anyone shine a little light on this for me please? Maybe a sentence or two on whether temperature variations have any impact on development except different timing? If this may have some impact on the recommendations - I have a tray processor with tempered and temp-stabilized water bath. Thanks so far -- deejay While it is usually stated that prints are developed to "completion" rather than to a specified contrast in fact to some extent development can be used to compensate for exposure. The contrast is not variable over much of a range if full blacks are to be obtained but some papers allow perhaps a half grade from development time change. Also, some papers, particularly warm tone papers, change image tone a little with variation in development time. Warmer for shorter times, cooler with longer times. At some point extending development will begin to increase fog more rapidly than the image. The time needed to develop full black wtih normal exposure depends somewhat on the emulsion and developer. Warm tone papers generally are developed for longer than neutral or cold toned ones. Active developers, like Dektol, develop more rapidly than less active ones like Selectol Soft. Most modern RC papers contain a layer of developer under the emulsion. This is to permit their use in rapid access "activation" processors but it also affects the development time in standard developers. These papers show an image quickly, perhaps 15 seconds, and develop fully in 60 to 90 seconds. There is little variation possible in development. Papers without incorporated developer show the first image more slowly, typically at around 30 seconds and usually take from 2 to 3 minutes to develop fully. The instructions for the paper will usually give a recommended time. Too short a time will give blotchy blacks or light blacks despite increased exposure, overly long development, more than about 5 minutes, may generate fog or poor blacks despite the long development. My target time for fiber and non-developer-incorporated RC papers is around 2 minutes, for developer incorporated papers around 75 seconds. I've found that judging print appearance during development to be difficult so I generally developed for a fixed time and decide if the print got the right exposure or is the right value of contrast in white light after the print is fixed. Many papers change appearance when dry so that is another complication. "Development to completion" is simply development until the blacks are at or near the maximum density the material is capable of. Film OTOH, is usually developed to a specified value of contrast. The exposure may be adjusted to keep the maximum density at a certain value, but it will most often be well below the maximum value the film is capable of. -- Richard Knoppow Los Angeles, CA, USA |
#3
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first of all, thanks to *everyone* who replied - all the comments compiled together are starting to make a little peace in my mind "Richard Knoppow" wrote in message oups.com... At some point extending development will begin to increase fog more rapidly than the image. The time needed to develop full black wtih normal exposure depends somewhat on the emulsion and developer. Warm tone papers generally are by the way - how do you use to calibrate to the "full black"? just expose the paper for extended time and develop to find out what black the paper can give and use that as reference? developed for longer than neutral or cold toned ones. Active developers, like Dektol, develop more rapidly than less active ones like Selectol Soft. Most modern RC papers contain a layer of developer under the emulsion. This is to permit their use in rapid access "activation" processors but it also affects the development time in standard maybe that's the reason for relatively short recommended times when using Ilford Multigrade developer... i'll go finding out as soon as i get to the datasheets again developers. These papers show an image quickly, perhaps 15 seconds, and develop fully in 60 to 90 seconds. There is little variation possible in development. Papers without incorporated developer show the first image more slowly, typically at around 30 seconds and usually take from 2 to 3 minutes to develop fully. The instructions for the paper will usually give a recommended time. Too short a time will give blotchy blacks or light blacks despite increased exposure, overly long development, more than about 5 minutes, may generate fog or poor blacks despite the long development. My target time for fiber and non-developer-incorporated RC papers is around 2 minutes, for developer incorporated papers around 75 seconds. i suppose you're talking developers of "standard" room temperature (e.g., around 20C), are you? I've found that judging print appearance during development to be difficult so I generally developed for a fixed time and decide if the especially if you use dip-processors or develop in drums that's why i'm asking here first - experimenting on the topic with such equipment would probably yield loads of ballast until some conclusion can be derived... print got the right exposure or is the right value of contrast in white light after the print is fixed. Many papers change appearance when dry so that is another complication. "Development to completion" is simply development until the blacks are at or near the maximum density the material is capable of. Film OTOH, is usually developed to a specified value of contrast. The exposure may be adjusted to keep the maximum density at a certain value, but it will most often be well below the maximum value the film is capable of. again, thanks for all the comments -- deejay |
#4
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first of all, thanks to *everyone* who replied - all the comments compiled together are starting to make a little peace in my mind "Richard Knoppow" wrote in message oups.com... At some point extending development will begin to increase fog more rapidly than the image. The time needed to develop full black wtih normal exposure depends somewhat on the emulsion and developer. Warm tone papers generally are by the way - how do you use to calibrate to the "full black"? just expose the paper for extended time and develop to find out what black the paper can give and use that as reference? developed for longer than neutral or cold toned ones. Active developers, like Dektol, develop more rapidly than less active ones like Selectol Soft. Most modern RC papers contain a layer of developer under the emulsion. This is to permit their use in rapid access "activation" processors but it also affects the development time in standard maybe that's the reason for relatively short recommended times when using Ilford Multigrade developer... i'll go finding out as soon as i get to the datasheets again developers. These papers show an image quickly, perhaps 15 seconds, and develop fully in 60 to 90 seconds. There is little variation possible in development. Papers without incorporated developer show the first image more slowly, typically at around 30 seconds and usually take from 2 to 3 minutes to develop fully. The instructions for the paper will usually give a recommended time. Too short a time will give blotchy blacks or light blacks despite increased exposure, overly long development, more than about 5 minutes, may generate fog or poor blacks despite the long development. My target time for fiber and non-developer-incorporated RC papers is around 2 minutes, for developer incorporated papers around 75 seconds. i suppose you're talking developers of "standard" room temperature (e.g., around 20C), are you? I've found that judging print appearance during development to be difficult so I generally developed for a fixed time and decide if the especially if you use dip-processors or develop in drums that's why i'm asking here first - experimenting on the topic with such equipment would probably yield loads of ballast until some conclusion can be derived... print got the right exposure or is the right value of contrast in white light after the print is fixed. Many papers change appearance when dry so that is another complication. "Development to completion" is simply development until the blacks are at or near the maximum density the material is capable of. Film OTOH, is usually developed to a specified value of contrast. The exposure may be adjusted to keep the maximum density at a certain value, but it will most often be well below the maximum value the film is capable of. again, thanks for all the comments -- deejay |
#5
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In article ,
PGG wrote: I typically develop until I see no more change in image and wait another 10 seconds or so. Is this a mistake? On Wed, 12 Jan 2005 06:58:49 -0800, Richard Knoppow wrote: e needed to develop full black wtih norm If your looking at the no change from the stand point of this is what I want, I think it is a mistake. Why you ask? Well,... because of dry down. -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#6
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Gregory Blank wrote: In article , PGG wrote: I typically develop until I see no more change in image and wait another 10 seconds or so. Is this a mistake? On Wed, 12 Jan 2005 06:58:49 -0800, Richard Knoppow wrote: e needed to develop full black wtih norm If your looking at the no change from the stand point of this is what I want, I think it is a mistake. Why you ask? Well,... because of dry down. In my opinion dry down (as with Richard's comment about using development times to achieve a change in image contrast/paper grade), should really be controlled through exposure, while development time (excluding adjustments for emergence time) to achieve that print contrast should be as consistent as possible. The reason seems obvious: the working strength of developers is not a constant and not predictable. Most papers, however, do have fairly consistent dry down factors expressed as a percentage of the exposure. -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#7
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In article , Tom Phillips
wrote: Gregory Blank wrote: In article , PGG wrote: I typically develop until I see no more change in image and wait another 10 seconds or so. Is this a mistake? On Wed, 12 Jan 2005 06:58:49 -0800, Richard Knoppow wrote: e needed to develop full black wtih norm If your looking at the no change from the stand point of this is what I want, I think it is a mistake. Why you ask? Well,... because of dry down. In my opinion dry down (as with Richard's comment about using development times to achieve a change in image contrast/paper grade), should really be controlled through exposure, while development time (excluding adjustments for emergence time) to achieve that print contrast should be as consistent as possible. The reason seems obvious: the working strength of developers is not a constant and not predictable. Most papers, however, do have fairly consistent dry down factors expressed as a percentage of the exposure. I agree, I was trying to make the point that the time to remove is the time to remove. :-) -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#8
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In article ,
Tom Phillips wrote: Well I'd agree he should just pick a time w/adjusted exposure and then use a factor method. OTOH 10 seconds post completion won't matter much, especially as you develop longer to comensate for emergence time. The weaker or more dilute the print developer, the slower working it is. I always anticipate the last 10 seconds as my timer counts down audibly at 10. So I begin "attempting" :-) to pull the paper out during the last ten. Sometimes I have been known to pull part of the sheet out and massage the stubborn parts of the image for up to a minute to get perfect contrast in a portion of the image,...takes a lot of care and I prefer "good exposures" to that technique by far. Hey maybe "I" should claim to be the world's greatest printer, LOL. -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#9
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Gregory Blank wrote: In article , Tom Phillips wrote: Well I'd agree he should just pick a time w/adjusted exposure and then use a factor method. OTOH 10 seconds post completion won't matter much, especially as you develop longer to comensate for emergence time. The weaker or more dilute the print developer, the slower working it is. I always anticipate the last 10 seconds as my timer counts down audibly at 10. So I begin "attempting" :-) to pull the paper out during the last ten. Sometimes I have been known to pull part of the sheet out and massage the stubborn parts of the image for up to a minute to get perfect contrast in a portion of the image,...takes a lot of care and I prefer "good exposures" to that technique by far. Hot souping might work better; I also prefer buring/dodging or other subtle contrast controls. Sometimes I divide the development using selectol but most of my prints are developed straight to completion. Hey maybe "I" should claim to be the world's greatest printer, LOL. And A.A. would be #2? -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#10
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In article ,
Tom Phillips wrote: And A.A. would be #2? Well I would mention names but it might start trouble :-) -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
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