I have an opportunity to pick up a very clean Pentax 67 135/4 for an excellent price and I have a few of questions about the lens. First, I've heard that it's the only "macro" lens that was made for the Pentax 67 system. Is this correct? Second, I've heard that it's not a true macro (i.e., that it doesn't go to 1:1 magnification without extension). Is this correct? Lastly, I've heard that it's IQ is not up to the standard of most other 67 lenses. So how good is the lens optically, and how well does it perform for general (i.e., non-closeup) shooting? Thanks in advance!