Recently I had the opportunity to have a Zenza-Bronica S2A with Nikkor 75 and 200mm lenses. Nice beast even if quite big and heavy. I'm interrested to buy a wide lens (40 or 50mm) and even after surfing all around the web, I still have 1 question. Do I need a specific focus ring for such lens or is working with the one I have (75-100mm model)? Thanks for any answers.