Thanks to Frank for poisoning Ben and me on the lens. This was actually bundled together with the film body Z-1 75th Anniversary Special Edition, Titanium Silver/Balck body.
It is now very difficult to even locate a good copy around the world as only 500 were made.
It was introduced in 1994 to mark the 75th anniversary of Asahi Pentax and came in a nice looking red box, but alas, the owners decided to break up the set to sell them separately.
I managed to take over from Ben as he decided he wanted a more mint copy from Japan and so got it for a friendship price.
I am now loving the lens on the K1 as it really is fast.
