I am glad that Ian has added his comments to this one. I had been producing AV Presentations using twin projectors, in my mediocre way, for about 20 years until I converted to digital projection twelve months ago. I had seen the yellowness mentioned by Ernst in digital projection, which put me off following that route, for a while, until I saw the results achieved by the CBAV Royale Digital Projection Unit at a National AV Festival in 2001. This encouraged me to purchase one of the first of these units and since then I have been busy making new sequences and re-making some of my original ones. I can confirm, therefore, that my roots are in the twin projector method, but digital and particularly PTE has opened up a whole new world in my AV presentations. Ron [uK]