I use Efke films all the time! Efke films (except the KB 400) are the old Adox emulsions someone might remember from the 50's - 70's. Efke KB/R 25 and 50 have thin ortopanchromatic emulsions, very fine grain and fun to use. KB/R 100 is an old style panchromatic film, and I have heard that it works well in PMK. Efke films are my favorites together with Agfa APX films.(posted 8488 days ago)