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#1
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Print Artifact
Hi Folks,
I have sporadically had this artifact on my B and W prints. In the current case, I am using Kodak Polycontrast C as the paper "negative" in a pinhole camera, that has produced excellent images recently. I just threw out the "old brown" that I was using, and filled the developer tray with fresh Dektol, diluted 1:1. When developing, a "billowing cloud" artifact forms on the image, eventhough you can still see the image in the background. The temp of the water for dilution was around 80 deg F, while the Dektol was room temp- around 68 deg F. Any thoughts on what could be causing the artifact? Thanks much, Dave PS- I have a scanned 67K version of the paper neg, that I can send to anyone who wishes to see the artifact, I don't see a way of posting the image on the forum. |
#2
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Print Artifact
Do you have ANY idea how vague this question is?
How can you expect an answer? Pathos wrote: Hi Folks, I have sporadically had this artifact on my B and W prints. In the current case, I am using Kodak Polycontrast C as the paper "negative" in a pinhole camera, that has produced excellent images recently. I just threw out the "old brown" that I was using, and filled the developer tray with fresh Dektol, diluted 1:1. When developing, a "billowing cloud" artifact forms on the image, eventhough you can still see the image in the background. The temp of the water for dilution was around 80 deg F, while the Dektol was room temp- around 68 deg F. Any thoughts on what could be causing the artifact? Thanks much, Dave PS- I have a scanned 67K version of the paper neg, that I can send to anyone who wishes to see the artifact, I don't see a way of posting the image on the forum. |
#3
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Print Artifact
"Pathos" wrote in message oups.com... Hi Folks, I have sporadically had this artifact on my B and W prints. In the current case, I am using Kodak Polycontrast C as the paper "negative" in a pinhole camera, that has produced excellent images recently. I just threw out the "old brown" that I was using, and filled the developer tray with fresh Dektol, diluted 1:1. When developing, a "billowing cloud" artifact forms on the image, eventhough you can still see the image in the background. The temp of the water for dilution was around 80 deg F, while the Dektol was room temp- around 68 deg F. Any thoughts on what could be causing the artifact? Thanks much, Dave PS- I have a scanned 67K version of the paper neg, that I can send to anyone who wishes to see the artifact, I don't see a way of posting the image on the forum. By cloud do you mean something in the image itself or a cloud of bubbles in the water? -- --- Richard Knoppow Los Angeles, CA, USA |
#4
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Print Artifact
Pathos wrote:
Hi Folks, I have sporadically had this artifact on my B and W prints. How about a sporadic camera light leak? Dan |
#5
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Print Artifact
Thanks for the replies. By billowing clouds, I mean that within the
image on the print, there are grey "splotches" that look like cotton balls covering the print randomly (obscuring the image where present), although it is possible to see the true image in the background, in areas not affected. I thought about like leak, but thought that it might be oriented towards one particular area (where the leak is) and that the cotton ball conformation would be hard to reconcile. Sorry for the inadequacy of my description, I'm a pathologist by profession- used to describing cancer, and only an amateur photographer. As I mentioned in the original post, I do have a scanned image that I'd be happy to send to anyone who wants to see it. Thanks and best regards, Dave |
#6
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Print Artifact
I think I have found the genesis of the artifact. I exposed a
"regular" negative on the same paper, using the same developer, and the artifact was not formed. I then tried the same process, but without putting a towel down at the bottom of the door (as I did not do this morning when I developed the image with the artifact), and the artifact reappeared. Hence, it does appear to be an issue of fogging, not from the camera, but from the entrance to the darkroom. Lesson learned. I'm still wondering why the fogging appears in such an unusual conformation on the print, as opposed to just a diffuse greying of the print, as seen when purposely preflashing print paper. Thanks to all for your input, Dave |
#7
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Print Artifact
"Pathos" wrote
By billowing clouds, I mean that within the image on the print, there are grey "splotches" that look like cotton balls covering the print randomly (obscuring the image where present), Sounds like not enough time and agitation in the developer. 2 minutes with reasonably constant agitation is about right for most papers and Dektol. Keep the developer between 68-75F/20-23C if you can. -- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. To reply, remove spaces: n o lindan at ix . netcom . com Fstop timer - http://www.nolindan.com/da/fstop/index.htm |
#8
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Print Artifact
Nicholas,
Thanks for your reply. This may have further exacerbated the artifact, as I did pull the prints early, as they were somewhat overexposed. I typically used 1 min for RC papers and 3 min for FB paper at 68 deg F. I may try some further experimentation to recreate the problem, and better define all the possible variables involved. BTW, I am originally from Painesville, and spent much of my graduate study time in Cleveland. Hope all is cold and grey ;-). Best regards, Dave |
#9
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Print Artifact
"Pathos" wrote
1 min for RC papers and 3 min for FB paper at 68 deg F. That should be plenty, and not the cause of the blotches. spent much of my graduate study time in Cleveland. Hope all is cold and grey ;-). You must be psychic. -- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. To reply, remove spaces: n o lindan at ix . netcom . com Fstop timer - http://www.nolindan.com/da/fstop/index.htm |
#10
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Print Artifact
On 16 Mar 2006 13:38:37 -0800, "Pathos" wrote:
PS- I have a scanned 67K version of the paper neg, that I can send to anyone who wishes to see the artifact, I don't see a way of posting the image on the forum. If you forward it to me (jd at legacy-photo.com) I can post it to my site. == John S. Douglas Photographer & Webmaster www.legacy-photo,com www.xs750.net |
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