I am about to get a novoflex fast-focus mount and lens (400 5.6 -- some coating loss, but device good). Any links to good history of system sites for novoflex. I know they still actively sell the Leica Telyt heads, as well as their own, and I think the various models share a great deal of interchangeability, such as mounts (they are up to version C, I think, and this one must be version A, as it is not labeled.) Wouldlike to know compatibility with mounts, hoods, etc. so I can be wise when I look around to fill out.