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  1. Thread: Avedon

    by interneg
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    15
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    545

    Re: Avedon

    There's a pretty big error of fact in that article: Avedon had been using a Deardorff since the early 1950's - he later acquired a Sinar Norma (with the shutter etc) for studio work, but it may have...
  2. Thread: Lupex Paper

    by interneg
    Replies
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    949

    Re: Lupex Paper

    This could be a horrible shock to some that are deeply emotionally invested in chloride papers, but modern multigrade papers and Lupex may be closer in terms of their basic composition (many modern...
  3. Re: Scanning 8x10 method Epson v850 super resolution lens

    Under any conditions - all that scanning at the higher resolution does is sharpen things a bit via downsampling (and add noise). Here's a way to consider what's happening - if the MTF50 (50% contrast...
  4. Re: Scanning 8x10 method Epson v850 super resolution lens

    The Epson scan system delivers in the 2200-2400ppi range under extremely high contrast test conditions. However that is pretty irrelevant when the MTF drops under 50% below 700ppi and drops under 10%...
  5. Re: Photographing Darkroom Prints To Be Shown Online

    If you want proper repro quality, you're going to need a cross polarised lighting & lens setup (not hard to do) & decent colour management (colour checker or equivalent). Really depends on what the...
  6. Re: What do the wide gamut profiles in DPL mean

    I'd suggest it's the other way round - DPL/ Aztek's software may be the exception that is pretty capable with colour negs, but a lot of (generally older & more geared to transparency) European...
  7. Re: What were the prevailing process in early 1900s?

    1880s-1890's maybe, by early 1900's it was much more technically sophisticated: bromoiodide emulsions on flexible film & glass plates with colour sensitivity starting to edge into the fully...
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    Re: DSLR scanning vs. Epson V800 scanning

    If you have the camera & lens, try it. It'll tell you enough as to how you should proceed very, very quickly. If necessary, renting a suitable lens to try should be fairly straightforward too.
  9. Replies
    15
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    625

    Re: DSLR scanning vs. Epson V800 scanning

    It certainly made clear a lot of the optical phenomena I'd encountered over the years from Epson scans - much more so than the (frankly rather useless) resolution tests that proliferate across the...
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    625

    Re: DSLR scanning vs. Epson V800 scanning

    It can be found here. It also provides a (teardown based) considerable level of detail about the construction of the Epson V7/8xx sensor systems.
  11. Replies
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    625

    Re: DSLR scanning vs. Epson V800 scanning

    You have to trade nominal pixel resolution against MTF/ Sharpness performance. Whatever the actual pixel resolution limit of the Epson is (it's effectively 2x 1200ppi sensors, 1/2 pixel offset from...
  12. Re: Yellow Staining on Negatives, Please Help

    I'd start by using acid stop and rapid fix (as you should with modern films) & see if that clears up the issue - you have 50% more surface area for oxidation etc to happen on a 7x17 compared to an...
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    5,774

    Re: Adox CMS 20 Slides, what bleaching chem ???

    Excessive solvency might be the cause of the problem - or it might not. That CMS 20 runs in Scala, but fails in other reversal systems tends to suggest that a development accelerator, rather than a...
  14. Replies
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    5,774

    Re: Adox CMS 20 Slides, what bleaching chem ???

    CMS20 runs well (if rather contrastily) in the old Agfa Scala process - the first developer of which seems to be disclosed here , specifically the following:

    4.5 g hydroquinone
    11.0 g Potassium...
  15. Replies
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    1,842

    Re: Linhof vs Berlebach for Sinar Norma

    Did Foba share parts/ design with some of Gitzo's bigger classic aluminium tripods (systematic/ series 5)? There seems to have been at least some shared DNA from what I've seen of Foba's tripods over...
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    895

    Re: strange Componon 240 lens

    Is there any indication as to the construction in terms of elements/ groups?
  17. Replies
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    895

    Re: strange Componon 240 lens

    Having been for a dig around a few late '50's Schneider catalogues/ distributors lists, I'm increasingly feeling that it's a prototype Comparon - by 1957-ish the full range of 5.6 Componons was...
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    895

    Re: strange Componon 240 lens

    'Schneider Kreuznach Componon 1:4.5/240' in the other images on the same listing. S/N in the 7,1xx,xxx range (sometime in 1961?).
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    895

    Re: strange Componon 240 lens

    The whole unit should be 75mm front to back.

    And whatever the lens itself is, it's in the wrong barrel for a Componon, which is an f5.6 lens...

    Edit: found the auction - it's unlikely to be...
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    Re: Spots like a dark sun - Rollei RXP 25

    It was worse than that on the faster emulsions - and it was because their emulsion plant was getting sufficiently unreliable that it wasn't evenly controlling heat during the melting step (I think)...
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    Re: Large format Astrophotography

    Home/ amateur telescopes that is... Kodak used to make a whole panopoly of specialist plates for the astrophotography market - I've encountered some in 1/4 plate, recommended on the box to be stored...
  22. Re: Any recommendation on an 8x10 lens for tabletop and sculpture

    What you are describing sounds a lot more like dancing to the strange identikit whims of a catalogue art director wanting both deep focus and no strange distortions of the product than doing creative...
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    Re: handling precautions?

    And exposure to concentrated ammonia (amongst many other things) can etch your corneas
  24. Replies
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    893

    Re: handling precautions?

    goamules, you're the one knee-jerking here.

    The European legislation about lead solder essentially covers objects/ products that could be handled/ potentially ingested by a child. That...
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    893

    Re: handling precautions?

    It's certain of the heavy metal salts (cadmium, lead, mercury) used in some collodion recipes that are very real potential health hazards. The cavalier attitude of wet plate practitioners towards...
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    1,505

    Re: print washers?

    No, it's because of the low levels of calcium carbonate, magnesium etc in the water.



    The granite's largely only in one corner of the country (watch out for the radon gas) but elsewhere...
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    Re: Experience with Colenta Processors

    That does look like a pretty clever machine - really does show how far process automation has come along too.
  28. Replies
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    1,505

    Re: print washers?

    Hypo-clear is really a non negotiable in Scotland - the tap water is so soft that it is quite essential with FB prints in my experience.
  29. Re: Luland Produced Super Large Format Camera 3D panorama Tripod Head

    I'd find the whole complaining about 'copying' a little less hypocritical if there was some acknowledgement of how many companies in the USA have ripped off Arca-Swiss' dovetail QR plate design over...
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    Re: 8x10 Camera Musing

    How did you go about ordering it? For my purposes it looks pretty good.
  31. Replies
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    3,130

    Re: 8x10 Camera Musing

    I do like the idea of an 8x10 with just a 300mm rail - at least for the focal lengths I prefer.
  32. Replies
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    1,083

    Re: Uva alt print box

    On the matter of safety, I've seen high power UV units wired so that you have to be out of the room & the door locked or (on smaller units like yours) there are baffles with microswitches on them...
  33. Re: De Vere 5108, negative carrier and timer questions

    It'll depend on the switching capacity of the timer's relay as to what else is going on inside the enlarger control box - the pin-out of the timer socket is identical across the entire range - it's...
  34. Re: De Vere 5108, negative carrier and timer questions

    The 5108 wiring is different from the smaller De Vere's because the 1200w dichroic head uses 4x ELH bulbs, wired in parallel in the US versions, mixed series/ parallel in the UK/ EUR versions to the...
  35. Re: De Vere 5108, negative carrier and timer questions

    This is the plug De Vere use, as far as I know.



    Regarding the carrier, the De Vere one is essentially two metal plates with nylon springs (not even really hinges) & clips for the glass - not...
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    Re: Linhof Ball-Head Mystery...

    Fixed them. For whatever reason they're surprisingly easy codes to get wrong compared to Durst/ Leitz/ De Vere.
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    1,890

    Re: Linhof Ball-Head Mystery...

    Bob - the current equivalent would be the 003323 plus 003755, and yes, the example I had in my hands was very stable, but the series 5 Gitzo was that bit 'deader', much like the column of De Vere...
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    Re: Linhof Ball-Head Mystery...

    The Heavy Duty Pro (390R is the code I think) tripod is a huge piece of kit - had the opportunity to A/B a vintage example directly against an old Gitzo aluminium Series 5 tripod a few months ago....
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    Re: Linhof Ball-Head Mystery...

    Linhof made an even better levelling head, with a milled bearing surface for extremely solid lockdown - the base diameter is about that of a #5 Gitzo top plate. Its smaller brother is in the centre...
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    385

    Re: Glass for enlargers or cameras

    Kienzle in Germany can cut glass of both sorts for enlarger carriers.
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