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Geoffrey Crawley`s FX-55 Formula.
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Geoffrey Crawley`s FX-55 Formula.
Neat! Thanks!
Any ideas why this ng has been so inactive lately? "Keith Tapscott." wrote in message ... http://tinyurl.com/59pklv -- Keith Tapscott. |
#3
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Geoffrey Crawley`s FX-55 Formula.
I'm not familiar with Acros, but I see that it's an iso 100 film, yet you
tested it at 80. Since phenidone developers typically yield an effective speed increase over the iso m-q standard, I'm wondering if you gave any thought to testing at iso 100 or above. "Keith Tapscott." wrote in message ... http://tinyurl.com/59pklv -- Keith Tapscott. |
#4
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Geoffrey Crawley`s FX-55 Formula.
"Lew" wrote in message ... Neat! Thanks! Any ideas why this ng has been so inactive lately? "Keith Tapscott." wrote in message ... http://tinyurl.com/59pklv -- Keith Tapscott. Digital photography is the answer. All the rec.photo newsgroups have fallen off, some have not had posts in a year. I still read about three but there is activity mainly in the digital group. Another reason is the continuing shift of Usenet users to private mailing lists. This is partly to avoid spam and partly because many Usenet lists became pretty uncivilized. Mailing lists are always moderated to some degree where there are few actively moderated Usenet groups now. Too bad. -- -- Richard Knoppow Los Angeles, CA, USA |
#5
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Geoffrey Crawley`s FX-55 Formula.
"Lew" wrote in message ... I'm not familiar with Acros, but I see that it's an iso 100 film, yet you tested it at 80. Since phenidone developers typically yield an effective speed increase over the iso m-q standard, I'm wondering if you gave any thought to testing at iso 100 or above. "Keith Tapscott." wrote in message ... http://tinyurl.com/59pklv -- Keith Tapscott. I am not familiar with Geoffrey Crawley's developers from a use standpoint but in general I agree with you about the above. Note that the presense of Phenidone will not automatically result in a speed increase, it depends on the rest of the formula. Also note that the _effective_ speed of a film depends on the contrast to which its developed. The contrast which is indirectly specified in the ISO standard for B&W negative still film is about right for printing with diffusion sources. When negatives are developed for the somewhat lower contrast required for condenser printing the speed is typically about 80 percent of the ISO speed. Developers certainly have some effect on speed but the range is not great. Using D-76 as a reference developers like T-Max, T-Max RS, Microphen, DDX, Xtol, etc., deliver about 3/4 stop greater speed for the ISO contrast. Developers like Microdol-X and Perceptol, when used full strength for their extra-fine-grain property, deliver about 3/4 stop less speed. Developers like Rodinal are somewhere in this bracket, in the case of Rodinal somewhat on the low speed side of D-76. Also note that duplicating the ISO measurements is not trivial. A simple speed test without the controlled exposure and carefully controlled development of the ISO test may result in a somewhat different speed. Also, the current version of the ISO standard no longer specifies a standard developer, rather any developer can be used provided its indicated along with the resulting speed. Some manufacturers, notably Kodak, will indicate effective speed in their development charts. Since the ISO standard is intended to indicate the minimum exposure which results in good tone rendition its often found that a somewhat greater exposure will give somewhat better shadow detail. -- -- Richard Knoppow Los Angeles, CA, USA |
#6
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Geoffrey Crawley`s FX-55 Formula.
In article ,
"Richard Knoppow" wrote: Another reason is the continuing shift of Usenet users to private mailing lists. This is partly to avoid spam and partly because many Usenet lists became pretty uncivilized. Mailing lists are always moderated to some degree where there are few actively moderated Usenet groups now. Too bad. I'm glad that you have stuck it out on Usenet, Mr. Knoppow. There are still people on Usenet who are looking for useful information, and you have always been a rich source of it. At the same time, it would be great to see you on APUG also. The level of activity on that site and the collective knowledge represented by the members is something marvelous. In case you are unaware, there is an analogue photography podcast which is available on iTunes now. So far the emphasis has been on interviews with professional photographers and why they use film for some or all of their work, but I'm hoping that there might be some more discussion of darkroom matters. There was a long interview with Ctein about dye transfer which I found fascinating. He candidly admitted where he found digital more useful, but was equally emphatic that for some purposes dye transfer is unequalled. Having never seen a dye transfer print, I can't comment intelligently on that. -- Charles Hohenstein (to reply, remove Gene Robinson) "The sad huddle of affluent bedwetters, thumbsuckers, treehuggers, social*climbers, homophiles, quavery ladies, and chronic petition signers that*makes up the current Episcopal Church . . ." -‹Thomas Lipscomb |
#7
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Geoffrey Crawley`s FX-55 Formula.
so it there a list or 2 that you personally favor? I don't mind an off-line
response if security is an issue. "Richard Knoppow" wrote in message ... "Lew" wrote in message ... Neat! Thanks! Any ideas why this ng has been so inactive lately? "Keith Tapscott." wrote in message ... http://tinyurl.com/59pklv -- Keith Tapscott. Digital photography is the answer. All the rec.photo newsgroups have fallen off, some have not had posts in a year. I still read about three but there is activity mainly in the digital group. Another reason is the continuing shift of Usenet users to private mailing lists. This is partly to avoid spam and partly because many Usenet lists became pretty uncivilized. Mailing lists are always moderated to some degree where there are few actively moderated Usenet groups now. Too bad. -- -- Richard Knoppow Los Angeles, CA, USA |
#8
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Geoffrey Crawley`s FX-55 Formula.
APUG looks slick, but it's way over automated. Pages nested in pages etc...
more passwords & profiles to remember, plus a fee for some services ... It's my firm belief that info & ideas should be exchanged freely and with the ease and simplicity of this ng. I wonder why the former group of posters didn't opt for a moderated email list. I use freelists.org for another platform. It's moderated & everyone's pretty happy with it. "Charles Hohenstein" wrote in message ... In article , "Richard Knoppow" wrote: Another reason is the continuing shift of Usenet users to private mailing lists. This is partly to avoid spam and partly because many Usenet lists became pretty uncivilized. Mailing lists are always moderated to some degree where there are few actively moderated Usenet groups now. Too bad. I'm glad that you have stuck it out on Usenet, Mr. Knoppow. There are still people on Usenet who are looking for useful information, and you have always been a rich source of it. At the same time, it would be great to see you on APUG also. The level of activity on that site and the collective knowledge represented by the members is something marvelous. In case you are unaware, there is an analogue photography podcast which is available on iTunes now. So far the emphasis has been on interviews with professional photographers and why they use film for some or all of their work, but I'm hoping that there might be some more discussion of darkroom matters. There was a long interview with Ctein about dye transfer which I found fascinating. He candidly admitted where he found digital more useful, but was equally emphatic that for some purposes dye transfer is unequalled. Having never seen a dye transfer print, I can't comment intelligently on that. -- Charles Hohenstein (to reply, remove Gene Robinson) "The sad huddle of affluent bedwetters, thumbsuckers, treehuggers, social climbers, homophiles, quavery ladies, and chronic petition signers that makes up the current Episcopal Church . . ." -Thomas Lipscomb |
#9
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Quote:
It`s not my site or test. I only posted the link because I thought that it might be of interest to those who like to experiment with raw chemicals. There is a new website for those who prefer film and darkroom photography and new members are welcome. http://www.film-and-darkroom-user.or...orum/index.php Last edited by Keith Tapscott. : December 14th 08 at 07:21 PM. |
#10
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Geoffrey Crawley`s FX-55 Formula.
"Charles Hohenstein" wrote in message ... In article , "Richard Knoppow" wrote: Another reason is the continuing shift of Usenet users to private mailing lists. This is partly to avoid spam and partly because many Usenet lists became pretty uncivilized. Mailing lists are always moderated to some degree where there are few actively moderated Usenet groups now. Too bad. I'm glad that you have stuck it out on Usenet, Mr. Knoppow. There are still people on Usenet who are looking for useful information, and you have always been a rich source of it. At the same time, it would be great to see you on APUG also. The level of activity on that site and the collective knowledge represented by the members is something marvelous. In case you are unaware, there is an analogue photography podcast which is available on iTunes now. So far the emphasis has been on interviews with professional photographers and why they use film for some or all of their work, but I'm hoping that there might be some more discussion of darkroom matters. There was a long interview with Ctein about dye transfer which I found fascinating. He candidly admitted where he found digital more useful, but was equally emphatic that for some purposes dye transfer is unequalled. Having never seen a dye transfer print, I can't comment intelligently on that. -- Charles Hohenstein (to reply, remove Gene Robinson) Thank you very much for the complement:-) I've seen a fair number of dye transfer prints. They look very good and seem to hold up fairly well. Dye tranfer has a long history: the system Kodak sold was actually bought by them from another company. Kodak had a previous system called Dye Imbibition, which was similar but the later version had many improvements. One advantage of DT is that the images are quite sharp. It was used in the advertising industry both for proofing and for making originals to be made into three color printing plates. The method which preceded Dye Transfer was the three-color carbon or carbro method. This is an exceedingly fussy and difficult process although it resulted in beautiful results. There were a handfull of labs in NYC that specialized in three-color-carbon to service the advertising business. Eventually direct photography of large Kodachrome originals replaced carbon although dye transfer remained a popular color printing method until computer printing displaced all photographic methods in the printing trades. I check into APUG occasionally, but there are now so many venues for discussion that its hard to keep up with them. Perhaps I should do it more often, there may be some old friends there. -- -- Richard Knoppow Los Angeles, CA, USA |
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