Originally posted by VIXIV Hah!! I cheated on my "No Ebay" pledge and looked at that lens. John O'Connell is a great seller and Pentaxian. I have bought from him frequently.
There once was a huge website of "Cult Classic" lenses (only the front page works now) and as I recall this lens was highly desireable in its day.
There was a discussion of Vivitar releasing non-standard f/stop lenses when they were at their most creative, and how those lenses were in high demand.
Your lens is a Komine, known as a high quality manufacturer.
I'd bet you'll be pleased.
You have the correct adapter.