Response to Dust, gritt, and cleaning my enlarger?

I recently had problems with enlargment quality caused by grit --inside-- the enlarger lens. Perhaps you should check the inner surfaces of your lens too. The grit evidently came from the paint on the diaphragm getting loose when changing the fstops (the enlarger lens is a top brand, but has been out of use for years). It was almost impossible to see the grit looking throught the enlarger lens, the only way to see it was to use a magnifying glass so that I could focus on the inner lens surfaces. The repair is nothing for DIY, the cleaning bill is $ 150, and it was really a necessary expense.

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