Durst CLS500, getting started

Discussion in 'Darkroom Equipment' started by Grainy, Jul 15, 2011.

  1. Grainy

    Grainy Member

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    I've been using my Durst Laborator 1200 with CLS 500 head for a few weeks now. So I have a few questions.

    When I change magenta, yellow or cyan, how much must I change the exposure time to get the same exposure as without filter? For example if I add 10 magenta.

    When I add density filter, how much must I change exposure? For example if I add 10 density.

    When composing the picture on the easel, what is the normal procedure? Adjust height, turning the handle next to the focusing arm and at last adjusting the focus?

    All the numbers on the column, what do you use them for? taking notes on which height you use for a spesific print size with a spesific lens and negative size? Or can I find this info somwhere so I don't need to take notes?

    So far the prints look OK after a lot of testprints, but knowing more about my questions will improve my workflow and results a lot.
     
    Last edited by a moderator: Jul 15, 2011
  2. Jeff Bannow

    Jeff Bannow Member

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    Is this mounted onto a Laborator 1200?
     
  3. Grainy

    Grainy Member

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  4. Jeff Bannow

    Jeff Bannow Member

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    Are you using the color filters for black and white printing then, in place of graded filters?
     
  5. Grainy

    Grainy Member

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    Yes. So far I have tried only to increase magenta in order to get more contrast. But then I had to make a couple of new testprints again.

    For example if 10 magenta equals xx percent more exposure then it would be easier.

    Do you recommend to by graded filters instead?
     
  6. Jeff Bannow

    Jeff Bannow Member

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    I have a chart that I use to determine the different paper grades. It's included in with all Ilford paper. It has roughly the same density for every filter setting. It works pretty well for me. There are methods of fine tuning those settings, but this should be a good starting point.

    http://www.estudiocasanueva.com.ar/archivo/Imgivrc.pdf

    Look on page 4.
     
  7. Grainy

    Grainy Member

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    Thanks. If I understand the chart correctly it says that using the two filter method will give me almost the same exposure.

    But what about one filter? "The first table titled “SINGLE FILTER METHOD”
    requires technicians to modify exposure when changing
    filtration." Technicians to change exposure?
     
  8. Bob-D659

    Bob-D659 Member

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    The "technicians" are the brains behind the hands operating the equipment. :smile:
     
  9. Grainy

    Grainy Member

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    Quite funny:D Why not just write "singel filter method requires to change the exposure when changing filtration"
     
  10. Bob Carnie

    Bob Carnie Subscriber

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    10 magenta = 1/3 stop
    30 magenta = full stop
    You will rarely need cyan
    O settings will be a grade two setting fyi.
    Yellow is minimal change
    I only used the Nuetral Density filter in rare occasions
    You can only use two filters at a time, using three just adds nuetral density.
    Yes do adjustment to crops as you say.
     
  11. Bob-D659

    Bob-D659 Member

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    The odd word usage is really due to the translation from Italian to English, as usually the translators first language is not english. You used to get way worse examples in manuals for asian equipment.