20x30 inch prints from a 6x4.5 screems out for tech pan. With the proper developer(s)an EI of 100 is possible. Photographers Formulary has a couple of developers that will give a 100 EI (I've not tried them). My experience has been with Ethol TEC and Diafine at 100. By the way, I don't own stock in the company, just that their film and paper developers meet my needs.(posted 8748 days ago)