I've just bought a Sinar Norma. I've done a bit of research and info on Sinar shutters is available on the net. If you've got problems let me know your e-mail and I'll send it on to you. I've also ordered a generic Sinar adapter plate from a company in China so that, with a bit of luck, I can use the lenses that I've got mounted on Wista sized lens boards on the Sinar. Once I have that and the rain stops I'll be out testing it.