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  1. Re: NEW BOOK: Finally, an easier and inexpensive (very) new technology for photogravu

    I know this is a very old thread, but I wanted to say that after a week of failing to make a polymer photogravure using the standard 2-exposure method, I saw this comment and tested directly printing...
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    Re: Lens element sources and specs?

    For me, the most interesting part would be to do some simple design work and learn basic optical engineering (I'm an engineer by training -- always fun to do someone else's real job for a while).
    ...
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    Re: Lens element sources and specs?

    This is fascinating. I would really like to build a lens, maybe from surplus elements.

    Is there a good book or web resource for learning how to do this? Ideally, more than just recipes but not...
  4. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    John,

    Yes, I believe plastic would work but you might need to design your tanks around it. PVC is a lot thicker than metal tubing. I only had about 3/4" at the bottom of my tanks and 1/2" at the...
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    Re: Wireless Flash Trigger Mounting Ideas for LF

    Bernice, thanks! Very helpful.
  6. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    Maybe a plastic coating or electroplating it. The holes in the plenum are so tiny (1/64") that any kind of coating is likely to clog them. They can be cleared out by re-drilling them but it's very...
  7. Re: Fuji HR-U X-Ray Film Developer Test: 510 Pyro, Rodinal, PaRodinal, D-23

    D-23

    D-23 produced dramatically softer negatives than the other developers tested and it was the most well behaved. Shadow detail was dramatically better than the other three. However, I can't say...
  8. Re: Fuji HR-U X-Ray Film Developer Test: 510 Pyro, Rodinal, PaRodinal, D-23

    PaRodinal (Tylenol developer)

    After seeing the smooth dense areas that Rodinal delivered, I decided to try making it. PaRodinal isn't Rodinal but it has the same developer (p-aminophenol). You...
  9. Re: Fuji HR-U X-Ray Film Developer Test: 510 Pyro, Rodinal, PaRodinal, D-23

    R09 One Shot Rodinal

    R09 Rodinal delivered a contrasty and noticeably sharper (higher acutance) negative than 510 Pyro. Dense (white) background areas were smoother and it masked uneven agitation...
  10. Fuji HR-U X-Ray Film Developer Test: 510 Pyro, Rodinal, PaRodinal, D-23

    Now that I have my 8x10 gas burst system working, I decided to see which developers work the best with it and Fuji HR-U x-ray film.

    I think I still like 510 Pyro the best but the others I tested...
  11. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    JBB, happy to share the code, though I think you should do something much simpler. PM me and I'll send you a link.

    My solution ended up being clean but is way overkill. If I were to do it again,...
  12. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    John, you're right -- the dead-end tube didn't end up working well so I replaced it with a Tee version (picture in my second post).
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    Re: Wireless Flash Trigger Mounting Ideas for LF

    Thanks for the ideas! There are a lot of cheap cold shoe options on amazon. I was thinking of buying one and making a mount for it to the camera.

    Bernice, could you tell me how the Sinar shoe...
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    Wireless Flash Trigger Mounting Ideas for LF

    Is there a known good solution for holding up the wireless flash trigger when connected via a wire to a shutter?

    The one I have is meant to mount in a hot shoe.
  15. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    I wanted to add that if you are willing to pay for standard full-strength chemicals and name-brand film, you will probably get excellent results with unmodified hangers and dip-and-dunk agitation....
  16. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    No, I don't use photoflo. But, I will try scrubbing the hangers. Maybe they're contaminated from a past life or with other stuff. Thanks for the idea!
  17. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    That's an impressive set up!

    Are you seeing corrosion on non-stainless fittings?
  18. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    Hi Matt,

    For whatever reason, I don't get surge marks with my unmodified 4-up kodak hangers, even with 1:250 pyro and dip-and-dunk agitation. My agitation technique is: lift, tip >45 degrees away...
  19. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    Finally, the gas source. Everything I read suggested an industrial gas bottle of nitrogen, which is inert and so won't oxidize the developer. I don't have a nitrogen bottle, but I do have argon for...
  20. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    The next challenge was to control the gas bursts. In spirit, the mechanism is very simple: a solenoid on a timer. Amazon has 12VDC normally closed solenoids for about $10. These can be controlled in...
  21. Re: DIY Gas Burst Agitation for 1 gallon vertical tanks

    From the first plenum, there were a few things I wanted to improve:

    1. 1/32" holes were too big. Too much pressure was dropping in the first few inches of tubing because it wasn't restrictive...
  22. DIY Gas Burst Agitation for 1 gallon vertical tanks

    I spent some time making gas burst agitation for my 1-gallon arkay style tanks and wanted to share what I learned.

    This older thread was extremely helpful:...
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    Re: 8x10 Vertical Tank Development Issues

    Hi Michael!

    I got a copy of that edition of View Camera and read your article while doing this! Thanks for the inspiration.
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    Re: Color separation negatives - CMYK no digital?

    Spinel black pigment is available from Kremer:
    https://shop.kremerpigments.com/us/shop/pigments/47400-spinel-black.html
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    Re: 8x10 Vertical Tank Development Issues

    At Tin Can's suggestion, I tried compressed air. It works!

    I used Fuji HR-U x-ray film with 510 pyro at 1:100. The photo was normally exposed at ISO 80 using a sekonic light meter and 5600K LED...
  26. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    Neal, interesting idea about temperature being an issue. I develop at room temperature, but I pre-soak the hangers and negatives in tap water, which is much cooler to start. I wonder if that's...
  27. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    Vaughn,

    X-ray film hangers are similar to what you suggest. The clips at the edges actually punch holes in the film with a little spike. Here are some for 14x17 film:
    223469
    223470

    I...
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    Re: Rodinal spots on Fuji HR-U

    Tin Can, Could you zoom in on one of your reference scans and see if you're getting spots too?

    I can't see them at 8x10 but they are clear in a 1000 dpi scan at 100% zoom.
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    Re: Rodinal spots on Fuji HR-U

    RockAndRolf, can you see the spots on the film (not just the print)?
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    Re: Rodinal spots on Fuji HR-U

    More details:

    - 4 minute pre-soak in tap water. San Francisco water is very pure.
    - Reverse osmosis filtered water used for Rodinal dilution
    - Rodinal mixed a few minutes before using (maybe sat...
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    Re: 8x10 Vertical Tank Development Issues

    I tested 510 pyro and rodinal bracketed from 3-6 minutes 68F 1:100 on Fuji HR-U. 3 minutes was thin, 4:30 - 5:30 was about right, 6:00 was getting too dense. However, the 6:00 negative had the most...
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    Re: 8x10 Vertical Tank Development Issues

    Hanger modifications are cataloged here:

    https://www.largeformatphotography.info/forum/showthread.php?166968-Modifications-to-Kodak-8x10-hangers-for-even-development-of-double-sided-X-Ray-film
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    Rodinal spots on Fuji HR-U

    I've been chasing even development with dilute developers on Fuji HR-U x-ray film.

    I've gotten good results with 510-Pyro at 1:100 for 5 minutes but Rodinal at 1:100 looks even smoother. The...
  34. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    The third change I made was to address the marks left on the rear emulsion by the clip at the top that holds the film in. It hangs down relatively far below what I consider the margin of the film. On...
  35. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    To fix the remaining surge marks at the bottom of the hanger, I used a cutoff wheel and a file to remove most of the metal in the bottom, creating long open slots:
    223439

    The result was no more...
  36. Re: Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray fi

    Kodak 4A hangers have holes all the way around the sides facing out and holes on one of the faces. I thought the holes on the face were to improve chemical flow to the emulsion but the holes appear...
  37. Modifications to Kodak 8x10 hangers for even development of double-sided X-Ray film

    I've been working on developing Fuji HR-U double-sided x-ray film in 1-gallon vertical tanks with Kodak 4A hangers and have made some good improvements that I wanted to share.

    I created a...
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    Re: 8x10 Vertical Tank Development Issues

    I've put a lot of work into this over the past few weeks and I'm starting to get satisfactory results. Here's a photo taken today against a white canvas backdrop:

    223417

    I ended up needing to...
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    Re: Epson v800 8x10 transparency vertical banding

    Well, technically it affects every scan of every negative. It's not a good choice for, say, archival preservation of large format negatives.

    However, it is rare that you will see the unevenness...
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    Re: Epson v800 8x10 transparency vertical banding

    I suspect it is a feature of the scanner -- specifically what it's doing with its calibration area. I just think it isn't very good at it over large areas. I'm sure it's a hard problem.

    If you...
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