Hi Greg, > I noticed that you had forced air cooling on your enlarger. Even so, a 2 hour exposure must be quite harsh on the enlarger and bulb. Not to mention the negative passing through the warping holder. Was there lots of creaking and popping of metal? The enlarger head does get quite hot and there is some heat cause metal fatigue which generally means one runs the risk of losing the negative and so I have not made many enlargements to be sure. Once I made one of a local avenue, mile long, that I photographed with a stip camera mounted in an old massive Olds with police escort so that the car would not have to stop along the way. The negative was about 20 feet long ... enlarged only 5X the length of the print was 100 feet. > The enlarger I saw on the internet looked like it was far less complicated and appeared to be designed for much shorter negatives. Hmmm ... I guess there are many variations on the theme but generally either the film remains stationary or it moves. For _REALLY_ long and large aspect ratio enlargements I believe the film must move. I suppose one could maybe keep the film and paper still and move the lens and light source and project onto the paper by way of a mirror ... hmmm. The Air Force's model moved the film and the paper but over drums of precalculated diameter, etc. Alan should be able to give us more details. I have not heard what he's been up to lately other than his experiments with tilted camera. cheerio, andy > Greg
