Hello , I have a durst laborator 54 and i have always used the diffuseglass betw een the bulb and the condensors. Now i removed it ,to see what the difference is , and the light on the groundplate shows some big dark spot ? I've used all the f-stops but the dark spot just got bigger or smaller . I tried to move the bulb but nothing happens ? (the corners on the groundplate turned into a red color w hen moving the bulb).The only thing i've noticed was a spot on the enlarger-lens (inside the lens) , is this the problem ? Well i'm saving money to buy me a new enlarger but the results with this laborat or 54 are still good , so maybe i have to replace the lens or just put the diffu ser back ?
as always , thanks for the previous answers ...
patrick.
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