Is is a Durst J606 enlarger equipped with a 300 watt halogen light source
which requires a 5 to 90 minutes exposure time depending upon the
negative's density range and the extent of the enlargement. I had
combined the light source and condensers from a B&H slide projector into
the Durst enlarger head (with 50mm f2.8) and added a cooling fan remotely
mounted with the cooling air fed through a flexible duct.
I have used it for extensive experimenting and find it reasonably sharp
though I feel that contact printing gives superior results.
If anyone is interested in building a copy, I will forward photos that
should be helpful.
Art Chakalis
Columbus, Ohio, USA