"OK, Don - I admit to being wrong. Here's what it says on the lens: SMC Pentax-F 4-5.6 35-80mm."
Ah, this one I have. It came with my ZX-50. You are right, it can give some quite decent results. This was taken with it:
http://pug.komkon.org/00octo/Djenne_Market_Day.html
My travel health nurse liked this so much that she borrowed the negative, and had a 20 x 30" enlargement made. At proper viewing distance, the print was quite decent.
Joe