Hi Steve, amazing thank you, useful to know that the precision of the backfocus varies with focal length. Yeah manual aperture is perfect for me would not want it automatic personally!
Have checked out some AI-s lenses on ebay, they are looking pretty nice, what are your thoughts on using a range of photography glass on a film project? I would be concerned about the color differences between lenses, which I have read that cines lenses reduce, however I have never actually done my own tests, so unsure of the problem?