Okay. I picked up a 1995-made 501c kit (in orig box) with the 80mm lens, A12 back and WLF. The lens serial # matches the box serial #. The lens and the box both list it as a "C" lens with T*, but it looks just like my 80mm CF lens, and takes a B60 filter. What is it? Everything I find seems to say the "C" lens took a B50 filter and would have a timer on it. And it appears they stopped making them in 1982. I don't think it's a CB as they appear to have started in 1997. My CF is labeled CF. I would assume a CFE or CFI would also be labeled as such, right?