Search:

Type: Posts; User: koraks; Keyword(s):

Page 1 of 54 1 2 3 4

Search: Search took 0.06 seconds.

  1. Replies
    6
    Views
    171

    Re: FPP super c-41 kit missing fixer

    Any B&W fixer wil PROBABLY work, but I'd recommend to use a near-neutral pH fixer (ca 6.5 would be nice). Acid fixer is not a good idea due to the risk of dyes (esp cyan I understand) remaining in...
  2. Re: What are these streaks on my neg - never seen before.

    These could be poor marks or even just drying marks.carefully examine the negatives, particularly the shiny side.
  3. Replies
    3
    Views
    288

    Re: Photronix Delta III Calibration

    Sounds good!

    As to the opamp and its offset voltage: it's not so much the opamp, although the 741 is ancient technology and positively abysmal in terms of today's quality standards. Yes, it will...
  4. Replies
    3
    Views
    288

    Re: Photronix Delta III Calibration

    A quick Google exercise turns up this thread: https://www.photrio.com/forum/threads/fs-photronix-densitometer.64325/
    It features a schematic (of doubtful image quality, but it's sort of readable):...
  5. Re: LED enlarger head for B&W -- question in passing

    In the first version of my led enlarger I tested a deeper color of blue. That is, for the final version I went with the universally recommended royal blue, which is around 450nm. Most/all led strips...
  6. Re: LED enlarger head for B&W -- question in passing

    @Ulophot, I understand about the typo and the fact someone else is building this for you, ok! The blue/green ratio still seems way off to me for a mid-range (ca 2.) contrast. You might want to look...
  7. Re: LED enlarger head for B&W -- question in passing

    1: You don't need the red for B&W printing. It's plain and simple like that, so don't worry about it.

    2: There's something very strange with your setup if you need more than an order of magnitude...
  8. Replies
    9
    Views
    405

    Re: RA4 paper question

    Yes; the Supreme is a significantly better paper in several respects IMO. It offers better dmax and comes on a somewhat sturdier base.
    I did not compare it side by side with DPII in terms of...
  9. Re: Is a Durst Laborator 1200 with a VLS 501 head a usable enlarger?

    That's a very usable enlarger and it seems to be in excellent condition as well. Moreover, this setup is not one of the 1980s-high-tech electronics contraptions that have become a maintenance...
  10. Replies
    18
    Views
    734

    Re: Durst CLS 1000 color head problem

    That's taken from the pdf I linked to earlier.
  11. Re: Use of X-ray film: technical discussion with example images

    Not any more than cleaning the toilet does.
    But a Andrew remarked, it's really not worth it to begin with.
  12. Replies
    18
    Views
    734

    Re: Durst CLS 1000 color head problem

    I'm not asking for myself but for others in the future with the same question so that they may more easily find this documentation.
    I myself don't own this piece of equipment and likely never will.
  13. Replies
    18
    Views
    734

    Re: Durst CLS 1000 color head problem

    Could you post a bigger version, please? I also found the one you posted online, but it's illegibly small and therefore useless.
  14. Replies
    18
    Views
    734

    Re: Durst CLS 1000 color head problem

    I searched for them when you first posted but haven't been able to find much of use.
    There's a service manual online that also covers the EST1000 (pages 10-12):...
  15. Replies
    30
    Views
    1,741

    Re: Contact Printing

    You don't need a yellow light; red is just fine.


    Might be OK for the dedicated contact printing paper @Willie mentions (Lupex, Lodima, Azo), but on regular printing paper (variable contrast or...
  16. Replies
    18
    Views
    734

    Re: Durst CLS 1000 color head problem

    Sounds like the fan exhibits excessive friction, likely due to the buildup of dirt and dust in it. See if you can clean it, or, perhaps more appropriately: see if you can get someone to replace it...
  17. Replies
    10
    Views
    623

    Re: Where to buy raw chemicals in Europe?

    Yeah, I think the original pyrocat formula called for something like a 20% sodium carbonate solution instead of potassium and then use something like 5x as much as it.

    The main challenge would be...
  18. Replies
    10
    Views
    623

    Re: Where to buy raw chemicals in Europe?

    https://www.deoplosmiddelspecialist.nl/
    They will sell you the carbonate and some other stuff depending on what you need. For more specific stuff but very, very long lead times (up to 6-9 months on...
  19. Re: Fomatone Classic (warmtone) fiber and safelights/contrast

    Foma MG Classic 131 vs Ilford MG FB WT
    Fomatone is pretty close to MGWT in terms of max contrast, but grade 0 is pretty different for both papers. You can compare with neutral tone emulsions based...
  20. Replies
    14
    Views
    875

    Re: Portra film ISO rating?

    400-speed film, even Portra, that's over a decade old will certainly show decreased performance. It might work OK-ish at 200 if you're not too critical about image quality. There'll be some...
  21. Replies
    21
    Views
    1,088

    Re: Developer Formulas for C-41 film?

    Like I said, anything can be corrected in PS. I don't doubt your results were satisfactory to you.

    I'm also aware of what Sandy is looking for. Hence my earlier comments. The Bonavolta recipe is...
  22. Replies
    21
    Views
    1,088

    Re: Developer Formulas for C-41 film?

    4g/l of sulfite doesn't sound right for c41. If the hydroxylamine is a problem, I'd suggest using a more same amount of sulfite (ca 1.0 ~ 1.5g) and just leave out the hydroxylamine sulfate. Mix...
  23. Replies
    23
    Views
    1,088

    Re: X Ray positives?

    You won't have to; exposures will be just a few seconds at a small aperture. Reciprocity is not going to be an issue. Just give it a try; expose say a 4x5" sheet in strips of consecutive stops (1...
  24. Replies
    3
    Views
    388

    Re: Linhof 13x18 enlarger add-on for Technika

    I agree with Greg. Especially if you're going to do the LED modification yourself with a DIY approach, I would start with any old enlarger you can get your hands on. Heck, doesn't even have to be 4x5...
  25. Replies
    21
    Views
    1,088

    Re: Developer Formulas for C-41 film?

    I've done quite a bit of DIY C41 and the differences between the various formulas I tried (including the ones linked to earlier) were minimal. I also found it just wasn't worth the hassle; the...
  26. Replies
    10
    Views
    614

    Re: PC-420D stirring speed

    Ouch, yeah, that sounds bad. Good to hear a replacement is on its way!
  27. Replies
    10
    Views
    614

    Re: PC-420D stirring speed

    Should be fairly easy to track down this particular problem. Just measure the voltage between the outer pins on the pot to establish which one is negative (most likely ground) and which is positive;...
  28. Replies
    8
    Views
    535

    Re: strange white deposit in fixer tray

    It's probably precipitated sulphur. If you allow a lot more to accumulate it'll look slightly yellow. Sulphur precipitated this way is indeed difficult to remove. Just scrub well.
  29. Re: Accidental Kodak Ektar development in Ilford DD-X

    C41 developer is NOT essentially a b&w developer! Bleaching Ektar negatives developed in DDX will give blank film with just the mask left, no image.

    Partial bleaching is theoretically possible to...
  30. Replies
    19
    Views
    1,663

    Re: LED darkroom bulbs?

    Well, wet plate is extremely slow and has negligible sensitivity to green light, so pretty much any kind of red or yellow light would be ok for it. Paper is a whole different matter, and fast ortho...
  31. Replies
    19
    Views
    1,663

    Re: LED darkroom bulbs?

    Sure, leds have a narrow spectrum. But they also have secondary emissions outside their primary spectrum. That's where the problems stem from. Take your cheap strips and view their light reflected on...
  32. Replies
    19
    Views
    1,663

    Re: LED darkroom bulbs?

    Try covering the bulbs with rubylith. Two layers generally does the trick. This cuts all but the red light, and dims the red light less than you'd have to do to get safe levels without the additional...
  33. Replies
    19
    Views
    1,663

    Re: LED darkroom bulbs?

    Red leds work magnificently; some straight out of the box,and some require additional filtering with e.g. rubylith to cut put the secondary green/yellow emissions. I've been using cheap Chinese...
  34. Re: Headless LF Enlargers Rise UP!.....................LED

    Yes, sort of. There are many caveats. But the principle does work. See here for extensive discussion, experiments and proofs of concept:...
  35. Re: Headless LF Enlargers Rise UP!.....................LED

    No worries, you'll rarely catch me on that. As well as dogs.
  36. Re: Headless LF Enlargers Rise UP!.....................LED

    I thought this thread was about random non-sequiturs loosely related to enlargers.
  37. Re: Headless LF Enlargers Rise UP!.....................LED

    I am. Many other are, too. Perhaps not in the LF scene, but over at Photrio there's a pretty active interest in optical RA4 printing.
  38. Replies
    8
    Views
    694

    Re: 2013 5X7 Enlarger LED Experiment Parts

    Not all led power supplies are created equal, sadly (or perhaps fortunately - they might all have been junk in this respect).
    Case in point: I purchased a led strip + fitting power supply the other...
  39. Re: Potentially useful LEDs for darkroom/alt applications

    Lucky you. My first LED color head had around 100W net power. This was insufficient to conveniently print on warm tone paper from 35mm negatives onto sizes of 11x14". I like to keep exposures between...
  40. Re: Potentially useful LEDs for darkroom/alt applications

    Yeah, there's many challenges Tin Can, I know. Before you know it you'll be going through a crash course of electrical engineering instead of making images. 'Luckily' for me electronics has always...
Results 1 to 40 of 2124
Page 1 of 54 1 2 3 4