I have some old 8x10 inch b&w negatives showing outdoor scenes. I took them to be scanned at a professional photo shop and indicated that instead of just scanning at 300 dpi I would like to get a higher dpi. The girl at the counter said she would have them scanned at max dpi. When I got them back they were scanned at 300 dpi. This seems very adaquet for my current needs but I wonder if I am losing anything with such a low dpi scan. How can I tell if I am able to get an enlargement as big as the negatives are capable of producing?