the condenser lenses that came with the Gnome are 4.25 inch diameter with a focal length of 21 inches. the ones out of the Czech enlarger are 3.75 inches in diameter with a focal length of 19 inches.
It will take a maximum negative size of 2.25 x 3.25 inches.
I have a third Gnome enlarger a lot older with the same diameter lenses which are 22.5 in focal length, even worse than the 21 inch ones!
I will get a working enlarger even if I have to dig out my old physics books from school to re-learn all about lenses and rebuild the thing!
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