What is the pentax smc da 50 200mm f 4 5 6 ed wr good for?

Here is what the site says about that.

From Pentax smc DA 50-200mm f/4-5.6 ED WR: Pentax smc DA 50-200mm f/4-5.6 ED WR: A zoom lens by Pentax for APS-C cameras, 50-200mm f/4-5.6. Specs - Maker: Pentax - Focal length: 50-200mm (zoom) - Maximum aperture: f/4-5.6 (it gets darker as you zoom in) - Made for: APS-C sensors - Mounts: Pentax K - Stabilised: no - Autofocus: yes What it frames like - On APS-C (Pentax K): like 75-300mm on full frame; f/4-5.6 gives about the depth of field of f/6-8.4 there. - ...

From [Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR: Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR](/gear/lenses/pentax-smc-da-18-135mm-f-3-5-5-6-ed-al-if-dc-wr/): A zoom lens by Pentax for APS-C cameras, 18-135mm f/3.5-5.6.

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