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  1. Re: Use of X-ray film: technical discussion with example images

    The suspense is killing me!! Are you going to tell what key was? :o

    I like that image. I see no blue tint..was this a clear base or did you digitally edit out the blue? I tried some positives...
  2. Thread: Red led Ribbon.

    by koraks
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    Re: Red led Ribbon.

    You'll need to test.
    One bicycle rear light is a lot less bright than a string of similar LEDs.
    In my experience red LED strips are usually not safe 'as is' without additional filtering with e.g....
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    Re: More 510-Pyro Adventures!

    The orange tone I got by bleaching out the silver; i.e. entirely removing it, leaving no silver halide either. You can see an example on my blog post. Perhaps the with/without silver halide explains...
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    Re: More 510-Pyro Adventures!

    The surprising thing is if you bleach back a Pyrocat negative, the stain image turns out to be orange. Whereas I share your experience that redeveloping a bleached back print in it gives an...
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    Re: Ilford Rapid Fix considerations

    All photographic emulsions are hardened. The only question is, by how much. There are distinct differences here and indeed it appears (subjective assessment) that Foma's film and paper tend to be...
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    Re: More 510-Pyro Adventures!

    :confused:

    Didn't realize it was a contest.
    Also not sure what 'anger' you read. Projection?
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    Re: Best choice portrait BW film

    I agree with virtually all of the rest you said, but you lost me on that sentence. Deep blacks are a property of the output medium. Regardless of what film used, it's a matter of giving the right...
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    Re: Best choice portrait BW film

    Didn't he purchase a ton of Tri-X when Kodak got into trouble?
    Frankly, Fomapan 100 would have been just as obvious a choice for that particular look as TMAX100. In fact, it would have been...
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    Re: More 510-Pyro Adventures!

    And as Andy was working on this, it so happened I was doing more or less the same...

    https://tinker.koraks.nl/photography/to-stain-or-not-to-stain-acid-and-pyro-developers/
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    Re: Push/Pull processing if Scanning Negative

    SergeyT, it probably works similar to a digital camera alright. Since a CCD is essentially a capacitor that charges as photons hit it, the obvious sensitivity choice you have as an engineer is...
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    Re: Push/Pull processing if Scanning Negative

    SergeyT, you might be right, assuming that the amplifiers and/or ADC's behind the CCD are fixed gain in scanners. I don't know if that assumption holds true. Do you?
    S/N ratios might indeed be far...
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    Re: Push/Pull processing if Scanning Negative

    Thanks for clarifying Doremus; I agree.
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    Re: Push/Pull processing if Scanning Negative

    I don't understand your question. Just to be clear: I was referring to Doremus' post about (silver halide) negatives being appropriate for scanning and/or wet printing onto silver gelatin paper.
    ...
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    Re: Push/Pull processing if Scanning Negative

    But by 'film', do you mean the physical product, or the negative made on it? In case of the latter, I agree to an extent. As you said, flat negatives tend to scan nicely, but may not print...
  15. Thread: Pigments

    by koraks
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    Re: Pigments

    So am I; his enthusiasm is contagious and I think it's inspiring in any case that someone picks exactly this as a profession/career.
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    Re: What photo paper grade means?

    You might have to elaborate a bit more what you mean/want to achieve. Based on what you've offered so far I couldn't return more than "printing on grade 4 will give higher contrast than at a lower...
  17. Thread: Pigments

    by koraks
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    Re: Pigments

    I sensitize the tissue with dichromate just before exposing, using a foam roller, diluted with ethanol. It then needs to be exposed as soon as possible when dry, which is between around 45 minutes...
  18. Thread: Pigments

    by koraks
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    Re: Pigments

    Yes Vaughn, it sure is difficult to make a meaningful comparison between pigments. So many factors influence the outcome. And there's always the question to what extent a comparison is necessary....
  19. Thread: Pigments

    by koraks
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    Re: Pigments

    Hey Bob,

    Great, thanks for the follow-up. Yes, many colorants would work and there are many ways to create a workable gamut. See e.g. Calvin's more recent work using natural pigments; it's a much...
  20. Thread: Pigments

    by koraks
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    Re: Pigments

    Bob, the best I can offer is something you probably already know about; the excellent overview of pigments compiled by Bruce MacEvoy at handprint.com; follow this one for the pigment index:...
  21. Thread: Pigments

    by koraks
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    Re: Pigments

    To answer my own question: it turns out that Kremer Furnace Black Pbk7 (which is essentially the same as 'lamp black' AFAIK) is a very neutral pigment of a fine grind and high tinting strength:...
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    Re: How to Clean Fixer Gunk?

    A wet cloth.
  23. Re: 24cm X 76 meters of Agfa Aviphot 200 has arrived

    I'll try to remember Daniel! It's in storage, easily accessible, but not a closet I use often, otherwise I would have included one already :)
  24. Re: 24cm X 76 meters of Agfa Aviphot 200 has arrived

    I built a very basic rig/frame of scrap pieces of wood and I clamp it to the worktop with heavy-duty spring-loaded clamps. The frame has a spindle mounted on it that I can slide out, put the roll on...
  25. Re: 24cm X 76 meters of Agfa Aviphot 200 has arrived

    For what it's worth, on my Dahle rotary trimmer, which happens to have a steel baseplate (your newly acquired Dahle has one, too) I use magnetic strips to make a stop. It's very easy to move around...
  26. Re: Help - 4x5 Negative Developing Issue - Looking for Ideas

    It looks like an agitation issue, but I'm sure that the use of a monobath has exacerbated the problem. Rest assured that you can get pretty nice and even development with the mod54 and fomapan 100...
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    Re: Spoon measure needed, please

    This is for your amusement: https://www.photrio.com/forum/threads/teaspoon-formulas-and-stickies.194573/

    I suspect the borax measurement isn't very critical.
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    Re: Paper size standards

    The next step up is in fact 11x14 as a standard film size. To a large extent photographic paper sizes tend to align with film sizes. This is both true in metric and imperial systems. I.e. 4x5", 5x7",...
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    Re: Fomapan 100 Base + Fog?

    Paul, not in PMK, but it works great in Pyrocat. I've also developed it in 510 pyro, but that developer tends to rather quickly generate overall stain which adds to b+f, so I don't prefer it for this...
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    Re: Fomapan 100 Base + Fog?

    Foma 100 has low b&f, comparable to FP4+. It's very suitable for making salt prints and other alt process prints. It's my default film for this purpose. It also develops to salt print densities in...
  31. Re: "Poll" Question: Do you use a footswitch for your enlarger?

    Yes, I use a footswitch. It's one I got in a box of parts from a friend; wired a coaxial cable to it and hooked that up to my DIY LED enlarger controller. I wouldn't want to go without one anymore.
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    Re: CLS 301 Restoration

    I feel that the discussion is moving away from the topic and is now about credentials, reputation and in the background, ego. I'm not interested in that direction. I don't doubt the validity of your...
  33. Re: Use of X-ray film: technical discussion with example images

    My point exactly. Which is why I press my point. If it's clear up front to someone what they're getting into, the chances that it's something they're actually looking for are higher. That's managing...
  34. Re: Use of X-ray film: technical discussion with example images

    Nobody said anyone promised anything.

    And so what who considers whom esteemed and whether people, esteemed or otherwise, post images?

    Why the aggravation? I just expressed my opinion and...
  35. Re: Use of X-ray film: technical discussion with example images

    The reasons you mentioned are certainly valid. And given the time and effort I put into trying to make x-ray film work for me, rest assured that I know from first-hand experience how they work and...
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    Re: CLS 301 Restoration

    Regardless if the wire you use, you're running a piece of metal equipment that you're physically intimate with whenever you work with it without any means of galvanic isolation. This is not a light...
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    Re: 4x5 macro advice needed

    @many, macro with a large camera is just a pain. Sure it works, but no matter what you do, it's always a road paved with a multitude of inconveniences.

    It's correct that you noticed you "can't...
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    Re: CLS 301 Restoration

    It's not about bells & whistles or quality of line regulation. It's a safety issue. The industry pretty much stopped making non-isolated equipment decades ago with the exception fo some plastic-cased...
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    Re: CLS 301 Restoration

    I'm not sure if I'd recommend removing the transformer unless a dedicated 1:1 separation transformer is fitted to the device in its stead.

    Btw, 'rewiring for direct current' is a bit of an...
  40. Re: Use of X-ray film: technical discussion with example images

    Nice shot. But not. Art. Hah!
    No really, it's a nice one.
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