I don't know the thinking behind assigning some of the Kodak film type numbers. Perhaps they were sequential, starting with 100 or 101? Meaning 127 was created sometime after, say, 122? 828 on the other hand, was for eight exposures on a roll of film 28x40mm. So the 8 and the 28 come from that. The idea was to have a "miniature" camera using unperforated 35mm roll film with a paper backing (for cheap cameras) and a notch for each frame (for more expensive cameras. It was a great idea but somehow did not catch on with the public. The difference between 120 and 620 is the spool- thinner, I think, for 620 although I am not sure what the supposed advantage was there. 126 was supposed to (I guess) replace 127. The thought there was to eliminate the tricky (for amateurs) film loading procedure by using a cartridge. But the film inside the cartridge was the same essentially as 828, right? Silver prices went through the roof in the 1960s and 70s and this was behind the ill-fated switch to 110. --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list