Curious, as a user of EFKE 100 in 7x17 and 8x10 sheet film, it was suggested that I may want to try EFKE 25...What are the main differences in the films from users please? I am using sheet film and contact printing so grain is not an issue for me. I am more interested in characteristics, like contrast, tone, effectiveness in low sbr, or high sbr, etc. Speed is also not a real issue as EFKE 100 is already pretty slow... Any thoughts out there? Thank you!