As part of revisiting some of our classic episode topics, this episode traces itself back to Season 2, Episode 13. The idea is that it is more important to invest in a lens system for your interchangeable lens systems; camera bodies are often cross-compatible once you're in the mount. Camera bodies come, and camera bodies go, but lenses are forever. In today's episode, each host will discuss a lens system they invested heavily in for their 35mm and 120 systems. While many of us have multiple systems, it would be an incredibly long episode if we all discussed every system. Today, we're talking about two Nikon systems, the autofocus and manual focus (mainly AI(-S)), Canon FD system, Olympus OM-System (manual focus), and in medium format, Pentax 67, Mamiya RB, Mamiya C-Series (TLR), and Mamiya m645!