@NM8A Since the process uses contact printing you need negatives of the same size as the print. Quite a few people are using vintage large format cameras, but I came to this as a hybrid, using digital negatives which are printed on transparencies. These negatives need to be carefully calibrated (tone curves) based on your specific printer (here Epson P900), emulsion mix and developer mix. Both the printer and the transparencies need to support a certain level of (ink) density to achieve a decent tonal range. The negatives are then exposed via strong UV light. Both the challenge and excitement come from the large number of parameters involved (at each step along the way), creating a lot of room for experimentation and making each print a unique handmade artifact...