Pentax hd da 16 85mm f 3 5 5 6 ed dc wr vs pentax 17 70mm f 4?

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From Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR: Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR: A zoom lens by Pentax for APS-C cameras, 16-85mm f/3.5-5.6. Specs - Maker: Pentax - Focal length: 16-85mm (zoom) - Maximum aperture: f/3.5-5.6 (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 24-128mm on full frame; f/3.5-5.6 gives about the depth of field of f/5.2-8.4 there. - ...

From Pentax HD DA 55-300mm f/4.5-6.3 ED PLM WR RE: Pentax HD DA 55-300mm f/4.5-6.3 ED PLM WR RE: A zoom lens by Pentax for APS-C cameras, 55-300mm f/4.5-6.3.

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