If the slower shutter speeds on my Rollei 35 are slow (1/15 stays open for a second when held down) and every speed below 1/30 is basically B, is that mean that the shutter speeds 1/30 and above have to be slower too? They sound ok, but good enough for slide film? I'm leaving on a trip and this camera is so small it's the only one I'm allowed to bring, and I don't have time for a test roll, so.. What do you think? With the shutter having to be constantly wound, I'm sure I'm not the only one where this problem has developed.