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  1. #11

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    I've got an old Kodak safelight with a colour filter. It's so dark I'm not even sure it's on. I want to say a 13 filter?

  2. #12

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    Quote Originally Posted by eumenius
    I have a very nice darkroom lamp - Durst Sanat, dedicated primarily to colour work, with a natrium spectral lamp inside plus an interference filter... alas, it was designed for old papers Today's papers like Kodak Endura are so sensitive that they get the nasty bluish fog with the lamp, though its light is quite indirect. One can minimize it by using some ND filters inside the lamp, but I prefer to work in a complete darkness for better safety. The ergonomics of your color darkroom is quite important, then

    Cheers from Moscow,
    Zhenya
    Well my darkroom is very small, so complete darkness isn't that bad. If there was a lamp that I could use that was completely harmless it would be just even better...

    I quickly sought the internet and indeed found some stuff about the Durst Sanat. Some are enthousisatic some less. If indeed newer paper is more sensible and therefor less suitable for natrium that is too bad.

    Maybe someone can make things even clearer.

    Game

  3. #13
    edz
    edz is offline

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    Quote Originally Posted by Gerald Koch
    Since color film is sensitive to all visible light the color darkroom must be completely dark.

    Sodium vapor safelights can only be used with B&W papers.
    Come-on Gerald! Sodium Vapor lamps are not just for B&W papers but quite well suited to colour. As with all lamps (notice I did not call them safelights yet) they must be tested with the environment and papers. Some like the Osram/Kaiser Duka lamp (NA-10FL sodium vapor lamp with integrated vapor deposited dichoic notch filter to only let the major line through) have even a (mechanical) mechanism to adjust the amount of light. Others like my Durst Sanat (NA-10 lamp + filter) or the Meteor-Siegen (SOX-E based lamp) need a bit more effort and are ill-suited to "on the fly" adjustment to different materials. Should attenuation, for instance, be needed with my Sanat it must be installed as a neutral density filter inside the lamp. I use both Osram/Kaiser Duka and Durst Sanat lamps in my darkroom.

    Some of the new RA-4 materials like Kodak's Endura have been designed for digital rendering in machines (Fontier, Lambda, LightJet and the like) and are really too sensitive (and fast) for our darkrooms but can still be used: loads of neutral density to our colour heads and safelights (resp. turning the Duka down very very low). Fuji Crystal Achive, however, is much slower and I've found I can run my lights at much higher levels (I also like the paper better).

    Since the light levels are lower than when working with B&W materials (I have a very bright hanging lamp from Kindermann called the Dukalux Tandem I got for B&W to conserve on my use of expensive sodium bulbs) not every inch of my darkroom is well flooded during colour sessions. To look for stuff I then use one of those glamorized LED pocket lights from Jobo.

    Add into the mix the light coming from my colour analyzer (Lici) and the place is hardly "total darkness"... and brighter than some "B&W" darkrooms I've seen (or not seen)...

    As one can tell I like to work in bright light :-)
    My design goal is to have things as bright (subjectively) as is possible without any detectable effects on my photosenstive materials. Its so bright in my darkroom--- even during colour sesssions--- that I don't need much any time to "adjust" my eyes.


    P.S.: These lamps are also suited to ILFOCHROME (!).
    Edward C. Zimmermann
    BSn R&D // http://www.nonmonotonic.net

  4. #14
    Bob F.'s Avatar
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    Colour papers have a sharp dip in their response at around 590nm which allows the use of sodium vapour lamps and suitable LED based safelights. As others have pointed out, you need to test your materials, especially with the sodium lamps as they reportedly drift in colour as they age.

    Cheers, Bob.

    P.S. Use of a sodium vapour lamp is why I can read my handwritten notes even when using VC B&W paper... their sensitivity does not reach much above 550-560nm - I find the red filter that comes with my Duka unnecessary.

  5. #15

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    Thanks for responses!
    I am not sure, but I think I indeed amm going to use the fuji paper. In that case I could pick up a Durst Sanat if I see one.
    I also read in the topic 'outofoptions' hyperlinked that one can use luminous tape to indicate places in the room.
    Seem like a usefull tip to me (not see stuff, but to find it. Like the main light in emergencies... or the input of my machine...), any objections against the tape?

    Game

  6. #16
    JohnArs's Avatar
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    Hi

    I have the Maxilux from Jobo wich I always used with Ilfochrome without any problem, works with LEDs. It has 3 different filter settings one for B&W one for Positive Diapaper and the last for normal Colorpaper.
    I only used it far away and indirect up to the white seiling.

  7. #17
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    Quote Originally Posted by Donald Qualls
    I've been told by experienced workers that RA-4 papers to in fact permit a very dim orange safelight. I don't know if it can be bright enough to actually see anything, but at the least, it'll let you cut down on bumping the enlarger with your head...
    I will second what Donald says above. I attended a community college in St. Louis that had them on the wall behind the enlargers. There was some disagreement about whether they should be on or not. From my experience it was not an issue when they were on. They were a very dim orange, although they didn't save my head.


    g

  8. #18

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    Guess, I'll be working in full darkness for a start. If that turns out to be very anoying I'll get back at this

  9. #19

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    Cooking water before mixing with developer

    Has anyone heard of cooking water before mixing with developer?
    In that way oxygenlevels should get lower and with that the oxydation of chemicals. This off course makes sure the mixure does not get old as quick as it would get normally...

    A guy in the shop told me this today....

    Game

  10. #20

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    hmm, I'll post the above in a new topic, seems quite out off place here....

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