Hi Jan, > it is a 6 x 4.5 In the Super Ikonta version, these (and the SI 6x9s) use the film window to regulate the film advance, so you should have no worry about frame overlap on those. > Never understood the 11-frames model. It would seem to me that the reason for 11 frames was to make the BX more attractive. There is nothing inherent in the mechanism that couldn't have been designed for 12 frames...after all, they did it on the BX. I never thought about seeing if I could retrofit the frame advance on the B with the mechanism from the BX. Hum. Couldn't be that easy... Regards, Austin --- 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