Anyone here use an sx-70? Since they stopped the production of time zero film, it's been really hard to get my hands on any. I've heard you can use 600 film in an sx-70, only you need a neutral density filter so my questions are:

1) Does anyone know a place that sells neutral density filters for sx-70s?
2) And also, does anyone know places to get 600 Matte Finish film?