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  1. #461
    David A. Goldfarb's Avatar
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    I've tried a number of light sources with Azo, and I've gotten the best result with a simple Ikea halogen desk lamp with the UV filter removed. It's pretty close to the the frame usually--about 1-2 feet depending on the format, and I don't seem to have problems with hotspots or falloff, and my exposure times with Azo are usually under 30 sec.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  2. #462
    Photo Engineer's Avatar
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    Chloride papers are sensitive to light intensity and suffer from reciprocity failure in both speed and contrast. I have seen exposures here from seconds to minutes. Maybe this is why people differ in their evaluations of contrast and speed. IDK. I would watch out for this wide variation if you wish to compare notes.

    PE

  3. #463
    David A. Goldfarb's Avatar
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    Quote Originally Posted by Photo Engineer View Post
    Chloride papers are sensitive to light intensity and suffer from reciprocity failure in both speed and contrast. I have seen exposures here from seconds to minutes. Maybe this is why people differ in their evaluations of contrast and speed. IDK. I would watch out for this wide variation if you wish to compare notes.

    PE
    I would echo this. Those of us who have short exposures in general seem to think that Canadian G2 Azo is a reasonable grade 2, while those who have long exposures think it's about a grade flat.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
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  4. #464
    Vaughn's Avatar
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    Quote Originally Posted by David A. Goldfarb View Post
    I would echo this. Those of us who have short exposures in general seem to think that Canadian G2 Azo is a reasonable grade 2, while those who have long exposures think it's about a grade flat.
    Would it not be the other way around? Would not reciprocity failure with paper (low-power light source -- long exposure times) cause the highlights to lag behind the mid-tones and shadows...causing an apparent increase in contrast?

    ...or is my thinking messed up as usual :o ?!

    Vaughn
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  5. #465
    David A. Goldfarb's Avatar
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    I haven't tried to figure it out theoretically, but this is my sense based on reports in the forums when Azo production went to Canada, and people seemed to be complaining about low contrast.

    Indeed, normally, when you compensate for reciprocity with film exposure and development, it's common to reduce development time to reduce contrast associated with RLF. Maybe PE or someone else has some insight.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  6. #466
    Vaughn's Avatar
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    Thanks, David. I use reciprocity failure with my film to help boost contrast for alt printing. Vaughn
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  7. #467
    Photo Engineer's Avatar
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    I can only echo what David says. Some comment on high contrast and others say low contrast. I have not had enough of both papers to test, so cannot comment except from what I have seen doing R&D. Kodak made papers in 2 "grades". One, for photofinishers and the other for professionals, had the same contrast but at 1/2 second and 10" respectively. They were adjusted due to reciprocity. Today, the laser papers and pro papers are similarly adjusted for this effect among other things.

    It requires specific metal doping, and if not done at the right time and in the right way, LIRF and HIRF will vary and this is probably why Canadian and US production of Azo varied.

    PE

  8. #468

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    Need Help:

    This is a "dog ate my homework" story.

    I just received this email:

    "The paper arrived at my farm. The problem is, my dog got to the package before we did and exposed all 100 sheets to the elements, not a pretty sight for the first acquisition for my new dark room! When can I order more paper (which I think I will have you ship to a neighbor's, where my dog can't get to it) ?"

    Unfortunately, we have no more paper available.

    Is there anyone who does not think they will want to use all of their paper and who can send part of it to the fellow with the uncontrollable dog. Is so, let us know and we will give you proper contact information paper. Financial arrangements can be made directly through the person needing the paper.

    Many thanks.

    Michael A. Smith

  9. #469

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    I have 2 of the 7 1/2" X 10", I'm sure I could part with one for a while.
    R

  10. #470
    Andrew O'Neill's Avatar
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    Looks like mine has finally arrived. Got a sticky note on the door from the mailman telling me to pick up package tomorrow...right when my son's hockey team's tournament starts.



 

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