I've done a bit of pinhole photography and the largest I printed to date was an 11X14. My son-in-law has asked if a large mural size print might be produced with reasonable quality from either a 4X5 or 6X17 on 120 negative. I have the ability to produce either however would be interested in knowing what others have experienced. He is thinking color and perhaps 4 feet by 5 feet or perhaps 3 feet by 8 or 9 feet from the 120. Any ideas or experience with going large out there? I would have to have a lab print one this large in color. Bill Barber