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  1. #1
    naaldvoerder's Avatar
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    Hello forum,

    After printing and developnh\ng zillions of teststrips to calibrate my RH designs Analyzer, I am at a loss. I keep ending up with outragious offsets and contrastsettings. Are there among you people who have experiance with the RH designs Analyzer? Help is very welcome.

    Thx JJ

  2. #2
    roy
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    Have you contacted RHDesigns and told them of your problems ?
    Roy Groombridge.

    Cogito, ergo sum.
    (Descartes)

  3. #3
    naaldvoerder's Avatar
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    Yes, i did. Dr. Ross did send my mail on to C. Woodhouse bit his reply did not help much. Itt took him about a week to reply aswell....

  4. #4

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    JJ,

    I do have an Analyzer Pro and have never had any problems with the calibration procedure. However, I prefer a continuously graded step tablet, where I can measure the ISO-R value with a simple ruler.

    You must first calibrate the offset (first non-white) and then the contrast settings (last non-black).

    What kind of light source does your enlarger have? Can you state your exact procedure? Are you calibrating for VC or graded paper?

  5. #5
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    Calibrating for FB and RC paper In Ilford multigrade developer. I use a Durst M601
    with colorhead but it is always on white light. I change grades with ilford filters. As is described i calibrated for speed first, but even the RC paper gets me values ranging from -14 to -26, in grades 2-5. For Forte FB paper the speed for grade 2 was okee but the contast level had to be changed from 80 to 145! I have the enlarger head adjusted for 30x40m prints (cm)

  6. #6
    naaldvoerder's Avatar
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    All VC papers

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    JJ,

    for working with color heads you should:

    - check whether you'd need the 0.5s delay feature, if you use an EST-Unit
    - avoid exposure times below 3 seconds (for all steps!)

  8. #8
    naaldvoerder's Avatar
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    What is an EST unit?

  9. #9
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    A stouffer step wedge was one of the best investments I ever made. It made calibrating my analyser pro quite easy.

  10. #10

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    Quote Originally Posted by naaldvoerder
    What is an EST unit?
    The DURST Power Stabilizers are usually named "EST xxx". They may have a switching delay which adds over-proportional to short exposure times.

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