Hello! I tried the new velvia 50 film, both in 135 and 120 formats. You can find 2 galleries at http://www.oltrelimmagine.net/Gallerie_soci/galleriesoci.php then click on "Simone" (the only one recognised with a square pictures) and go to "Sardegna2007" (Sardinia 2007). In the precedent 120 film roll could see a little more sensibility, about 1/3 stop so I decided to expose this film at 64 iso. For 135: Pentax lx, meter on 64 iso For 120: Pentax 6x7 , meter on 80 iso (this camera overexpose of about 1/3 stop, so I corrected to have a 64 iso effective sensibility) For any question I'm present, but excuse my poor english! Enjoy!