I have two different Compur shutters which both has same problem. The times 1s, 1/2s and 1/4s are precise, so are times from 1/30s to 1/100s (above that, the speed doesn't change much). The problematic times are 1/8s and 1/15s, which both gives exactly same time as 1/100s position. I have gone thru several synchro-compur shutters, but these two are only ones with this problem. According to manual: http://benoit.suaudeau.perso.neuf.fr/manuels_rep/obturateurs/compur-repair/06-03.html The speed of 1/15 second can be adjusted somehow, but I just can't figure how. The repair manual suggest for bending detent pin but it sounds a bit brutale operation. As far as I understood correctly, the detent pin is the one marked in Fig 4 in this page: http://benoit.suaudeau.perso.neuf.fr/manuels_rep/obturateurs/compur-repair/04-10.html Anyone done this? Or is it just better to not care about that and just not to use times 1/8 and 1/15s ?