Dear all I am new to this forum. I have searched this forum and only got some introduction about the rolleisoft and rollei duto filters. As far as I know, they are both soft filters; come in a pair of 0 and 1 version. I also noticed from people's picture of the duto filter that the glass has ecentric circles on it. Does rolleisoft filter have the same? But technically what are the differences between the two? If they function the same, which one is preferred? Thanks and regards.