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  1. #1
    Jorge Oliveira's Avatar
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    I've received today an EM10 enlargement meter I've purchased at Ebay.
    Here are the first impressions:

    It works!

    I did not use it as per Ilford instructions - nor did I purchase it intending to.
    I used it as per:
    http://fox.vis.pl/filmy/ilford/em10graph.pdf

    One measures the higlights (equivalent to expose to the shadows) and get an approximate value of paper grade/filter from the graph.

    The main difference was, that in my case, exposure was not as suggested in the graph - 9s at a reading of 90 in the dial, but
    3s (?).


    I feel that with more tests, it will be a very helpful tool.

    Jorge O

  2. #2
    Ole
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    Quote Originally Posted by Jorge Oliveira
    It works!
    Jorge, mine works too!

    I have found that it is sensitive to the safelight when measuring highlights, until I started turning off the light I could never measure anything higher than 80. I have my own calibration graph for Ilford Multigrade, and it seems to give me good results. I suspect the meters may differ quite a bit, but they don't seem to be drifting.
    -- Ole Tjugen, Luddite Elitist
    Norway

  3. #3
    Jorge Oliveira's Avatar
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    Hello, Ole

    Silly me...
    Since I was doing a test, I used gaded paper that's cheaper over here - and more sensitive to light.
    Will redo the test with with VC later this week.

    My enlarging timer/light dimmer combo will turn off the safelight during focusing, so safelight is not a problem.
    Next step will be generating my own curve, as you've done.

    But the most interesting part is that, beyond any doubt, it's a poor man's densitometer at un unbeatable price.

    Don't you think the green light is too bright (in darkness)?

    Jorge O

  4. #4
    Ole
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    Quote Originally Posted by Jorge Oliveira
    Don't you think the green light is too bright (in darkness)?
    Can't say it has ever bothered me...

    I've tested every paper I have - some is 20 years old - and found most papers differ by at most a stop as measured with the EM10. I've got some more stuff to test now - there was a pack of Bergger Contact in the mail today - along with a few grammes of Amidol and 100g of Glycin! Back to the darkroom!
    -- Ole Tjugen, Luddite Elitist
    Norway

  5. #5
    Jorge Oliveira's Avatar
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    Ole

    Sheer curiosity - which is the calibration number of your unit (mine is 26)?

    Jorge O

  6. #6
    Ole
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    Jorge, the number is 25. I have no idea what it means, though...
    -- Ole Tjugen, Luddite Elitist
    Norway

  7. #7
    Jorge Oliveira's Avatar
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    This number is calibrated in the factory for Ilford's recommended light level (whatever it is).
    I've seen somewhere else 30.
    If our very limited sample is representative (25 to 30), it means there is little production spread - 27.5 +/- 2.5 (less than 10%) and the EM10 are quite similar one to the other.

    Just electronic engineer curiosity. (-:

    Thanks,

    Jorge O

  8. #8

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    Hi there, I've been following your thread with some interest. I just checked my EM10 and the calibration number is 28. I've never used it as you suggest but I am going to try it out, thanks.

    Brian
    Brian McDowell

  9. #9

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    Jorge O - Is there an article that further explains that chart you referenced?

    BTW my calibration # is 25.

  10. #10
    Ole
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    Bob,

    Using that chart is rather simple: You measure your highlight, stopping down (or up) as needed to bring the reading into range with the numbers on the "9s", "12s" etc boxes.

    You then measure the shadows - the bright bits on the negative. Putting this number on the graph gives you the paper grade that's appropriate for a straight print.
    -- Ole Tjugen, Luddite Elitist
    Norway

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