A while back, I inquired on this forum about drum scanning labs that can handle large (12x20 and 7x17) sheets of film. Several people recommended Ian Mazursky at PrePress Express. I just got back a half dozen drum scans from some ULF negatives, and they are excellent. They are very clean and he did a superb job of capturing the entire tonal range of the negative. I could not be happier with the result. I have my own drum scanner and do all my own scanning for 8x10 and smaller, so I know a good job when I see it, and his work is excellent. Highly recommended for people wanting to print their 12x20s even larger!