I've just run my first film through my brand new (to me) c330f pro. I am thoroughly enjoying the slower and more deliberate style of shooting with this TLR but I have come across a query while using it. On the non professional model, according to the manual from buktus it has an iso setting on the lens lock dial. My model does not. My query is how is it possible to push the iso rating of the film or is this not possible with this camera? I'm used to using my 35mm cameras and just dialling in an extra stop or two when needed and this one has stumped me. Any help would be really appreciated. Thanks in advance.