Folks, Most of my work (architecture and commercial) is done with a 4x5 as this gives reasonable output for magazines and most enlargements. I have been asked to do some work for a trade-show exhibit where the prints will be 40x60 and larg er. The orginals will be Velvia transparencies which are drum scanned. My question is at what size print should I start providing 8x10 originals instead of the 4x5? Does anyone have any experience with this? Thanks for your help.