I do not wish to arouse issues of condenser versus diffusion enlargers here. I use both for the unique benefits that each has to offer. My concern is that I don't have, and have experienced great difficulty in obtaining, instructions for the set-up procedure for the Durst L 1200 opal globe condenser head. I have preiously fiddled about until the illuminated area on the baseboard 'looked' even I am sure there is a more precise methodology. If anybody can offer the relevant information I would be most thankful.