Is the pentax hd d fa 70 210mm f 4 ed sdm wr worth buying used?

Here is what the site says about that.

From Pentax HD D FA 70-210mm f/4 ED SDM WR: Pentax HD D FA 70-210mm f/4 ED SDM WR: A zoom lens by Pentax for Full frame cameras, 70-210mm f/4. A lighter alternative to the f/2.8 telephoto zoom. Specs - Maker: Pentax - Focal length: 70-210mm (zoom) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On full frame (Pentax K): as marked, 70-210mm. - On APS-C (Pentax K): like 105-315mm on full ...

From Buying used: Buying used: Cameras and lenses are built to last, and many photographers upgrade often. That makes the used market one of the best ways to afford good gear. A body that's one or two generations old is often most of the camera for a fraction of the price.

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