I have found the lens I used to use most of the time with my K-1000. It's a Sigma 35-135 f3.5/4.5 I bought in the early 80s, so it's nearly 30 years old. It's an 'A' lens, so it works on the K-7 in manual focus mode. Zoom/focus is by the same "one touch" ring; push-pull zoom and twist focus. This has a very smooth, well-damped action. At 135mm it has a macro mode, too. Many holiday snaps have been taken with this lens over the years, and as they were seldom blown up beyond 6x4 I never really saw what the lens was capable of.
The answer is - it's rather soft and images definitely lack contrast. A lens hood (I have mislaid that) might help a bit with the contrast. Overall verdict: still a useful, versatile lens but image quality not up to what I now find acceptable. I am still amazed that such an old lens can be attached to a modern camera body and be fully functional. Try doing that with a 30 year old item of computer equipment! It says a lot for Pentax's original design for the K-mount.
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